Report coverage to codecov rather than coveralls. (#113084)

.github/workflows/coverage.yml

@@ -17,12 +17,13 @@ jobs:
       checks: write  # for coverallsapp/github-action to create new checks
     name: coverage
     runs-on: ubuntu-latest
+    if: ${{ github.repository == 'flutter/flutter' }}
     steps:
       - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
       - name: ./bin/flutter test --coverage
         run: pushd packages/flutter;../../bin/flutter test --coverage -j 1;popd
       - name: upload coverage
-        uses: coverallsapp/github-action@9ba913c152ae4be1327bfb9085dc806cedb44057
+        uses: codecov/codecov-action@81cd2dc8148241f03f5839d295e000b8f761e378
         with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          path-to-lcov: packages/flutter/coverage/lcov.info
+          files: packages/flutter/coverage/lcov.info
+          verbose: true