Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/maven.yml

@@ -65,7 +65,7 @@ jobs:
     # - name: Setup tmate session
     #   uses: mxschmitt/action-tmate@v3
     - name: Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
 
   snapshot:
     if: github.repository == 'release-engineering/pom-manipulation-ext' && github.event_name == 'push' && github.ref == 'refs/heads/main'