instead of manual combining using codecov for simple process

Author: nagajaideep

.github/workflows/ci.yml

@@ -53,20 +53,14 @@ jobs:
           python -m pip install gcovr
           gcovr -r . --xml-pretty --output coverage-cpp.xml
       
-      - name: Merge Coverage Reports
-        run: |
-          python -m pip install coverage
-          coverage combine coverage-python.xml coverage-cpp.xml
-          coverage xml -o merged-coverage.xml
-      
       - name: Upload Coverage
         uses: codecov/codecov-action@v3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           directory: ./coverage/reports/
           env_vars: OS,PYTHON
           fail_ci_if_error: false
-          files: ./merged-coverage.xml
+          files: ./coverage-python.xml,./coverage-cpp.xml
           flags: unittests
           name: codecov-umbrella
           path_to_write_report: ./coverage/codecov_report.txt