Update golangci/golangci-lint-action action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
           cache: false  # The golangci-lint action does its own caching.
 
       - name: Lint
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v6
         with:
           version: ${{ env.GOLANGCI_VERSION }}