build(actions): update codecov/codecov-action to v4 (#227)

This commit fixes some node16 deprecation warnings

Author: gerardroche

actions/run-tests/action.yaml

@@ -38,4 +38,4 @@ runs:
         echo "Please call the action `codecov/codecov-action` directly".
       shell: bash
     - if: inputs.codecov-upload == 'true'
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4