chore(deps): update module mvdan.cc/gofumpt to v0.9.0 (#7292)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [mvdan.cc/gofumpt](https://redirect.github.com/mvdan/gofumpt) |
`v0.8.0` -> `v0.9.0` |
[![age](https://developer.mend.io/api/mc/badges/age/go/mvdan.cc%2fgofumpt/v0.9.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/go/mvdan.cc%2fgofumpt/v0.8.0/v0.9.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>mvdan/gofumpt (mvdan.cc/gofumpt)</summary>

###
[`v0.9.0`](https://redirect.github.com/mvdan/gofumpt/blob/HEAD/CHANGELOG.md#v090---2025-09-02)

[Compare
Source](https://redirect.github.com/mvdan/gofumpt/compare/v0.8.0...v0.9.0)

This release is based on Go 1.25's gofmt, and requires Go 1.24 or later.

A new rule is introduced to "clothe" naked returns for the sake of
clarity.
While there is nothing wrong with naming results in function signatures,
using lone `return` statements can be confusing to the reader.

Go 1.25's `ignore` directives in `go.mod` files are now obeyed;
any directories within the module matching any of the patterns
are now omitted when walking directories, such as with `gofumpt -w .`.

Module information is now loaded via Go's [`x/mod/modfile`
package](https://pkg.go.dev/golang.org/x/mod/modfile)
rather than executing `go mod edit -json`, which is way faster.
This should result in moderate speed-ups when formatting many
directories.

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/open-telemetry/opentelemetry-go).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS45MS4xIiwidXBkYXRlZEluVmVyIjoiNDEuOTEuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiU2tpcCBDaGFuZ2Vsb2ciLCJkZXBlbmRlbmNpZXMiXX0=-->

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: dmathieu <damien.mathieu@elastic.co>

attribute/iterator_test.go

@@ -56,7 +56,7 @@ func TestMergedIterator(t *testing.T) {
 		for _, k := range keys {
 			result = append(result, attribute.Int(k, num))
 		}
-		return
+		return result
 	}
 
 	for _, input := range []inputs{

baggage/baggage.go

@@ -648,7 +648,7 @@ func parsePropertyInternal(s string) (p Property, ok bool) {
 	// If we couldn't find any valid key character,
 	// it means the key is either empty or invalid.
 	if keyStart == keyEnd {
-		return
+		return p, ok
 	}
 
 	// Skip spaces after the key: "   key<    >=    value  ".
@@ -658,13 +658,13 @@ func parsePropertyInternal(s string) (p Property, ok bool) {
 		// A key can have no value, like: "   key    ".
 		ok = true
 		p.key = s[keyStart:keyEnd]
-		return
+		return p, ok
 	}
 
 	// If we have not reached the end and we can't find the '=' delimiter,
 	// it means the property is invalid.
 	if s[index] != keyValueDelimiter[0] {
-		return
+		return p, ok
 	}
 
 	// Attempting to parse the value.
@@ -690,14 +690,14 @@ func parsePropertyInternal(s string) (p Property, ok bool) {
 	// we have not reached the end, it means the property is
 	// invalid, something like: "   key    =    value  value1".
 	if index != len(s) {
-		return
+		return p, ok
 	}
 
 	// Decode a percent-encoded value.
 	rawVal := s[valueStart:valueEnd]
 	unescapeVal, err := url.PathUnescape(rawVal)
 	if err != nil {
-		return
+		return p, ok
 	}
 	value := replaceInvalidUTF8Sequences(len(rawVal), unescapeVal)
 
@@ -706,7 +706,7 @@ func parsePropertyInternal(s string) (p Property, ok bool) {
 	p.hasValue = true
 
 	p.value = value
-	return
+	return p, ok
 }
 
 func skipSpace(s string, offset int) int {

bridge/opentracing/mix_test.go

@@ -568,9 +568,8 @@ func (bio *baggageInteroperationTest) addAndRecordBaggage(t *testing.T, ctx cont
 	return ctx
 }
 
-func generateBaggageKeys(key string) (otKey, otelKey string) {
+func generateBaggageKeys(key string) (string, string) {
-	otKey, otelKey = key+"-Ot", key+"-Otel"
+	return key + "-Ot", key + "-Otel"
-	return
 }
 
 // helpers

exporters/otlp/otlptrace/otlptracehttp/mock_collector_test.go

@@ -145,15 +145,16 @@ func (c *mockCollector) getInjectHTTPStatus() int {
 	return status
 }
 
-func (c *mockCollector) getInjectResponseHeader() (h map[string]string) {
+func (c *mockCollector) getInjectResponseHeader() map[string]string {
+	var h map[string]string
 	if len(c.injectResponseHeader) == 0 {
-		return
+		return h
 	}
 	h, c.injectResponseHeader = c.injectResponseHeader[0], c.injectResponseHeader[1:]
 	if len(c.injectResponseHeader) == 0 {
 		c.injectResponseHeader = nil
 	}
-	return
+	return h
 }
 
 func readRequest(r *http.Request) ([]byte, error) {

internal/tools/go.mod

@@ -234,6 +234,6 @@ require (
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	honnef.co/go/tools v0.6.1 // indirect
-	mvdan.cc/gofumpt v0.8.0 // indirect
+	mvdan.cc/gofumpt v0.9.0 // indirect
 	mvdan.cc/unparam v0.0.0-20250301125049-0df0534333a4 // indirect
 )

internal/tools/go.sum

@@ -673,7 +673,7 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.6.1 h1:R094WgE8K4JirYjBaOpz/AvTyUu/3wbmAoskKN/pxTI=
 honnef.co/go/tools v0.6.1/go.mod h1:3puzxxljPCe8RGJX7BIy1plGbxEOZni5mR2aXe3/uk4=
-mvdan.cc/gofumpt v0.8.0 h1:nZUCeC2ViFaerTcYKstMmfysj6uhQrA2vJe+2vwGU6k=
+mvdan.cc/gofumpt v0.9.0 h1:W0wNHMSvDBDIyZsm3nnGbVfgp5AknzBrGJnfLCy501w=
-mvdan.cc/gofumpt v0.8.0/go.mod h1:vEYnSzyGPmjvFkqJWtXkh79UwPWP9/HMxQdGEXZHjpg=
+mvdan.cc/gofumpt v0.9.0/go.mod h1:3xYtNemnKiXaTh6R4VtlqDATFwBbdXI8lJvH/4qk7mw=
 mvdan.cc/unparam v0.0.0-20250301125049-0df0534333a4 h1:WjUu4yQoT5BHT1w8Zu56SP8367OuBV5jvo+4Ulppyf8=
 mvdan.cc/unparam v0.0.0-20250301125049-0df0534333a4/go.mod h1:rthT7OuvRbaGcd5ginj6dA2oLE7YNlta9qhBNNdCaLE=

propagation/propagators_test.go

@@ -24,22 +24,20 @@ var (
 	spanID  = mustSpanIDFromHex(spanIDStr)
 )
 
-func mustTraceIDFromHex(s string) (t trace.TraceID) {
+func mustTraceIDFromHex(s string) trace.TraceID {
-	var err error
+	t, err := trace.TraceIDFromHex(s)
-	t, err = trace.TraceIDFromHex(s)
 	if err != nil {
 		panic(err)
 	}
-	return
+	return t
 }
 
-func mustSpanIDFromHex(s string) (t trace.SpanID) {
+func mustSpanIDFromHex(s string) trace.SpanID {
-	var err error
+	t, err := trace.SpanIDFromHex(s)
-	t, err = trace.SpanIDFromHex(s)
 	if err != nil {
 		panic(err)
 	}
-	return
+	return t
 }
 
 type outOfThinAirPropagator struct {

semconv/internal/http.go

@@ -121,7 +121,7 @@ func hostIPNamePort(hostWithPort string) (ip, name string, port int) {
 	if parsedPort, err = strconv.ParseUint(portPart, 10, 16); err == nil {
 		port = int(parsedPort) // nolint: gosec  // Bit size of 16 checked above.
 	}
-	return
+	return ip, name, port
 }
 
 // EndUserAttributesFromHTTPRequest generates attributes of the

semconv/internal/v2/http.go

@@ -285,7 +285,7 @@ func firstHostPort(source ...string) (host string, port int) {
 			break
 		}
 	}
-	return
+	return host, port
 }
 
 // RequestHeader returns the contents of h as OpenTelemetry attributes.

semconv/internal/v2/net.go

@@ -287,27 +287,27 @@ func splitHostPort(hostport string) (host string, port int) {
 		addrEnd := strings.LastIndex(hostport, "]")
 		if addrEnd < 0 {
 			// Invalid hostport.
-			return
+			return host, port
 		}
 		if i := strings.LastIndex(hostport[addrEnd:], ":"); i < 0 {
 			host = hostport[1:addrEnd]
-			return
+			return host, port
 		}
 	} else {
 		if i := strings.LastIndex(hostport, ":"); i < 0 {
 			host = hostport
-			return
+			return host, port
 		}
 	}
 
 	host, pStr, err := net.SplitHostPort(hostport)
 	if err != nil {
-		return
+		return host, port
 	}
 
 	p, err := strconv.ParseUint(pStr, 10, 16)
 	if err != nil {
-		return
+		return host, port
 	}
 	return host, int(p) // nolint: gosec  // Bit size of 16 checked above.
 }

semconv/internal/v3/http.go

@@ -285,7 +285,7 @@ func firstHostPort(source ...string) (host string, port int) {
 			break
 		}
 	}
-	return
+	return host, port
 }
 
 // RequestHeader returns the contents of h as OpenTelemetry attributes.

semconv/internal/v3/net.go

@@ -287,27 +287,27 @@ func splitHostPort(hostport string) (host string, port int) {
 		addrEnd := strings.LastIndex(hostport, "]")
 		if addrEnd < 0 {
 			// Invalid hostport.
-			return
+			return host, port
 		}
 		if i := strings.LastIndex(hostport[addrEnd:], ":"); i < 0 {
 			host = hostport[1:addrEnd]
-			return
+			return host, port
 		}
 	} else {
 		if i := strings.LastIndex(hostport, ":"); i < 0 {
 			host = hostport
-			return
+			return host, port
 		}
 	}
 
 	host, pStr, err := net.SplitHostPort(hostport)
 	if err != nil {
-		return
+		return host, port
 	}
 
 	p, err := strconv.ParseUint(pStr, 10, 16)
 	if err != nil {
-		return
+		return host, port
 	}
 	return host, int(p) // nolint: gosec  // Bit size of 16 checked above.
 }

semconv/internal/v4/http.go

@@ -286,7 +286,7 @@ func firstHostPort(source ...string) (host string, port int) {
 			break
 		}
 	}
-	return
+	return host, port
 }
 
 // RequestHeader returns the contents of h as OpenTelemetry attributes.

semconv/internal/v4/net.go

@@ -287,27 +287,27 @@ func splitHostPort(hostport string) (host string, port int) {
 		addrEnd := strings.LastIndex(hostport, "]")
 		if addrEnd < 0 {
 			// Invalid hostport.
-			return
+			return host, port
 		}
 		if i := strings.LastIndex(hostport[addrEnd:], ":"); i < 0 {
 			host = hostport[1:addrEnd]
-			return
+			return host, port
 		}
 	} else {
 		if i := strings.LastIndex(hostport, ":"); i < 0 {
 			host = hostport
-			return
+			return host, port
 		}
 	}
 
 	host, pStr, err := net.SplitHostPort(hostport)
 	if err != nil {
-		return
+		return host, port
 	}
 
 	p, err := strconv.ParseUint(pStr, 10, 16)
 	if err != nil {
-		return
+		return host, port
 	}
 	return host, int(p) // nolint: gosec  // Bit size of 16 checked above.
 }