build(deps): bump the gh-actions group with 1 update

Bumps the gh-actions group with 1 update: [codecov/codecov-action](https://github.com/codecov/codecov-action).


Updates `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
  dependency-group: gh-actions
...

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

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
           docker compose -f docker-compose.test.yml exec -T backend pytest --cov=app --cov-report xml tests/
           docker compose -f docker-compose.test.yml cp backend:/app/coverage.xml ./coverage-src.xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage-src.xml