ci: bump codecov/codecov-action from 4.6.0 to 5.0.2

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4.6.0 to 5.0.2.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4.6.0...v5.0.2)

---
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/tests.yml

@@ -121,15 +121,15 @@ jobs:
 
       - name: "Upload general coverage to Codecov"
         if: ${{ matrix.backend_dir_name == 'the_simplest_backend' }}
-        uses: codecov/codecov-action@v4.6.0
+        uses: codecov/codecov-action@v5.0.2
         with:
           name: codecov-general
           files: ./tests/${{ matrix.backend_dir_name }}_coverage.xml
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: false
 
       - name: "Upload ml-backend ${{ matrix.backend_dir_name }} coverage to Codecov"
-        uses: codecov/codecov-action@v4.6.0
+        uses: codecov/codecov-action@v5.0.2
         with:
           name: codecov-${{ matrix.backend_dir_name }}
           files: ./label_studio_ml/examples/${{ matrix.backend_dir_name }}/coverage.xml