build: add depguard

.golangci.yaml

@@ -1,5 +1,6 @@
 run:
-  go: 1.20
+  go: "1.20"
+  timeout: 5m
 linters:
   enable:
     - thelper
@@ -12,7 +13,7 @@ linters:
     - forbidigo
     - tagliatelle
     - misspell
-
+    - depguard
 linters-settings:
   forbidigo:
     forbid:
@@ -23,3 +24,9 @@ linters-settings:
       rules:
         yaml: snake
         json: snake
+  depguard:
+    rules:
+      main:
+        deny:
+          - pkg: "github.com/pkg/errors"
+            desc: "use stdlib instead"