fix exception rule for oauth handler

.golangci.yml

@@ -1,4 +1,4 @@
 issues:
   exclude-rules:
-    - path: internal/user/handler_oauth.go
+    - path: pkg/user/handler_oauth.go
       text: 'SA1029: should not use built-in type string as key for value; define your own type to avoid collisions'