Bump python-gitlab from 4.11.1 to 4.12.1

Bumps [python-gitlab](https://github.com/python-gitlab/python-gitlab) from 4.11.1 to 4.12.1.
- [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@v4.11.1...v4.12.1)

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

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

requirements/base.txt

@@ -19,7 +19,7 @@ jira==3.8.0
 Markdown==3.7
 PyGithub==2.4.0
 Pygments==2.18.0
-python-gitlab==4.11.1
+python-gitlab==4.12.1
 python-redmine==2.5.0
 topicaxis-opengraph==0.5
 tzdata==2024.2