Bump python-gitlab from 4.1.1 to 4.2.0

Bumps [python-gitlab](https://github.com/python-gitlab/python-gitlab) from 4.1.1 to 4.2.0.
- [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@v4.1.1...v4.2.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements/base.txt

@@ -18,7 +18,7 @@ jira==3.5.2
 Markdown==3.5.1
 PyGithub==1.58.2
 Pygments==2.17.2
-python-gitlab==4.1.1
+python-gitlab==4.2.0
 python-redmine==2.4.0
 topicaxis-opengraph==0.5
 tzdata==2023.3