GitHub Viewer

## Changes ### Documentation and testing Please consider whether this PR needs documentation and tests. **This is not required**, but highly appreciated: - [ ] Documentation in the matching [docs section](https://github.com/python-gitlab/python-gitlab/tree/main/docs) - [ ] [Unit tests](https://github.com/python-gitlab/python-gitlab/tree/main/tests/unit) and/or [functional tests](https://github.com/python-gitlab/python-gitlab/tree/main/tests/functional)