Update paambaati/codeclimate-action action to v6

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -52,4 +52,4 @@ jobs:
     - name: Report code coverage
       if: "${{ github.ref == 'refs/heads/master' && matrix.ruby-version == '3.0' }}"
       continue-on-error: true
-      uses: paambaati/codeclimate-action@v5
+      uses: paambaati/codeclimate-action@v6