ci: bump codecov/codecov-action from 6 to 7 (#115)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 6 to 7.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-action/compare/v6...v7)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -74,7 +74,7 @@ jobs:
 
       - name: Upload coverage to Codecov
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-        uses: codecov/codecov-action@v6
+        uses: codecov/codecov-action@v7
         with:
           files: ./coverage/lcov.info
           fail_ci_if_error: true