chore: bump python-gitlab from 4.5.0 to 4.8.0

Bumps [python-gitlab](https://github.com/python-gitlab/python-gitlab) from 4.5.0 to 4.8.0.
- [Release notes](https://github.com/python-gitlab/python-gitlab/releases)
- [Changelog](https://github.com/python-gitlab/python-gitlab/blob/main/CHANGELOG.md)
- [Commits](python-gitlab/python-gitlab@v4.5.0...v4.8.0)

---
updated-dependencies:
- dependency-name: python-gitlab
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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