Fix depguard linter configuration (open-telemetry#2190)

Author: swiatekm

.golangci.yaml

@@ -44,12 +44,13 @@ linters-settings:
     min-confidence: 0.8
 
   depguard:
-    list-type: denylist
-    include-go-root: true
-    packages-with-error-message:
-      # See https://github.com/open-telemetry/opentelemetry-collector/issues/5200 for rationale
-      - sync/atomic: "Use go.uber.org/atomic instead of sync/atomic"
-      - github.com/pkg/errors: "Use 'errors' or 'fmt' instead of github.com/pkg/errors"
+    rules:
+      main:
+        deny:
+          - pkg: sync/atomic
+            desc: "Use go.uber.org/atomic instead of sync/atomic"
+          - pkg: github.com/pkg/errors
+            desc: "Use 'errors' or 'fmt' instead of github.com/pkg/errors"
 
 linters:
   enable: