Fix implementation and tests

Author: leandrodamascena

.github/workflows/quality_check.yml

@@ -79,6 +79,6 @@ jobs:
         uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24 # 5.4.3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          file: ./coverage.xml
+          files: ./coverage.xml
           env_vars: PYTHON
           name: aws-lambda-powertools-python-codecov