chore(ci): update golangci-lint to v2.6

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: appleboy

.github/workflows/go.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Setup golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.0
+          version: v2.6
           args: --verbose
   test:
     strategy: