Merge pull request #15 from Flutter-Dart-Open-Source/renovate/codecov-codecov-action-3.x

chore(deps): update codecov/codecov-action action to v3

Author: hoc081098

.github/workflows/flutter.yml

@@ -43,4 +43,4 @@ jobs:
       - name: Run tests
         run: flutter test --coverage --coverage-path=lcov.info
 
-      - uses: codecov/codecov-action@v2.1.0
+      - uses: codecov/codecov-action@v3.1.0