chore: update linter

.golangci.yml

@@ -26,10 +26,13 @@ linters-settings:
       - ^spew\.Print(f|ln)?$
       - ^spew\.Dump$
   depguard:
-    list-type: denylist
-    include-go-root: false
-    packages:
-      - github.com/pkg/errors
+    rules:
+      main:
+        deny:
+          - pkg: "github.com/instana/testify"
+            desc: not allowed
+          - pkg: "github.com/pkg/errors"
+            desc: Should be replaced by standard lib errors package
   godox:
     keywords:
       - FIXME
@@ -199,6 +202,7 @@ linters:
     - containedctx # too many false-positive
     - maintidx # kind of duplicate of gocyclo
     - nonamedreturns # Too strict
+    - gosmopolitan  # not relevant
 
 issues:
   exclude-use-default: false