fix: update golangci-lint-action to v6 and remove deprecated linters

Co-authored-by: hsluoyz <3787410+hsluoyz@users.noreply.github.com>
Agent-Logs-Url: https://github.com/casdoor/casdoor/sessions/7c8360de-bb17-4fd6-8106-81a46e803e81

.github/workflows/build.yml

@@ -82,7 +82,7 @@ jobs:
       - run: touch dummy.yml
 
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v6
         with:
           version: latest
           args: --disable-all -c dummy.yml -E=gofumpt --max-same-issues=0 --timeout 5m --modules-download-mode=mod

.golangci.yml

@@ -1,7 +1,6 @@
 linters:
   disable-all: true
   enable:
-    - deadcode
     - dupl
     - errcheck
     - goconst
@@ -17,14 +16,11 @@ linters:
     - nakedret
     - prealloc
     - staticcheck
-    - structcheck
     - typecheck
     - unconvert
     - unparam
     - unused
-    - varcheck
     - revive
-    - exportloopref
 run:
   deadline: 5m
   skip-dirs: