Replace \r\n on Windows as we do for \n on Linux

Closes #717

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+- Fixed bug where, on Windows, variables were ending with `\r` because we were
+  only removing the final `\n` but not `\r\n`
+  ([#717](https://github.com/go-task/task/issues/717)).
+
 ## v3.12.0 - 2022-03-31
 
 - The `--list` and `--list-all` flags can now be combined with the `--silent`

internal/compiler/v3/compiler_v3.go

@@ -151,7 +151,8 @@ func (c *CompilerV3) HandleDynamicVar(v taskfile.Var, dir string) (string, error
 
 	// Trim a single trailing newline from the result to make most command
 	// output easier to use in shell commands.
-	result := strings.TrimSuffix(stdout.String(), "\n")
+	result := strings.TrimSuffix(stdout.String(), "\r\n")
+	result = strings.TrimSuffix(result, "\n")
 
 	c.dynamicCache[v.Sh] = result
 	c.Logger.VerboseErrf(logger.Magenta, `task: dynamic variable: '%s' result: '%s'`, v.Sh, result)