Bump codecov/codecov-action from 4 to 5

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4 to 5.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4...v5)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/flutter_ci.yaml

@@ -85,7 +85,7 @@ jobs:
         run: flutter pub get
       - name: widget test
         run: flutter test --verbose --coverage --coverage-path=./coverage/lcov.widget_test.info --concurrency=1
-      - uses: codecov/codecov-action@v4 # https://docs.codecov.com/docs/merging-reports#multiple-languages
+      - uses: codecov/codecov-action@v5 # https://docs.codecov.com/docs/merging-reports#multiple-languages
         with: # ref: https://github.com/codecov/codecov-action/blob/v4.1.0/.github/workflows/main.yml
           files: ./coverage/lcov.widget_test.info
           flags: widget_test,${{ matrix.os }}
@@ -147,7 +147,7 @@ jobs:
       - name: integration test
         run: ${{ matrix.integration_test_command }}
       # https://docs.codecov.com/docs/merging-reports#multiple-languages
-      - uses: codecov/codecov-action@v4
+      - uses: codecov/codecov-action@v5
         with: # ref: https://github.com/codecov/codecov-action/blob/v4.1.0/.github/workflows/main.yml
           files: ./coverage/lcov.integration_test.info
           flags: integration_test,${{ matrix.os }}