Update golangci-lint version to v2.9

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: appleboy

.github/workflows/go.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.6
+          version: v2.9
   test:
     strategy:
       matrix: