Bump python-gitlab from 6.0.0 to 6.1.0

Bumps [python-gitlab](https://github.com/python-gitlab/python-gitlab) from 6.0.0 to 6.1.0.
- [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@v6.0.0...v6.1.0)

---
updated-dependencies:
- dependency-name: python-gitlab
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/base.txt

@@ -18,7 +18,7 @@ jira==3.8.0
 Markdown==3.8.2
 PyGithub==2.6.1
 Pygments==2.19.2
-python-gitlab==6.0.0
+python-gitlab==6.1.0
 python-redmine==2.5.0
 topicaxis-opengraph==0.5
 tzdata==2025.2