Update testing-ci.yml

Author: C-Achard

.github/workflows/testing-ci.yml

@@ -69,7 +69,7 @@ jobs:
           echo '```' >> "$GITHUB_STEP_SUMMARY"
 
       - name: Upload coverage to Codecov
-        if: github.event_name == 'push' || (github.event_name == 'pull_request' && github.base_ref == 'main')
+        if: github.event_name == 'pull_request' && (github.base_ref == 'main' || github.base_ref == 'master')
         uses: codecov/codecov-action@v5
         with:
           files: ./coverage.xml