Bump codecov/codecov-action from 2.0.2 to 2.0.3 (#13)

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -55,7 +55,7 @@ jobs:
           python -m pytest --cov=./ --cov-report=xml --verbose
 
       - name: Upload code coverage to Codecov
-        uses: codecov/[email protected].2
+        uses: codecov/[email protected].3
         with:
           file: ./coverage.xml
           flags: unittests