Bump python-gitlab from 5.4.0 to 5.6.0 (#11687)

Bumps [python-gitlab](https://github.com/python-gitlab/python-gitlab) from 5.4.0 to 5.6.0.
- [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@v5.4.0...v5.6.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -46,7 +46,7 @@ titlecase==2.4.1
 social-auth-app-django==5.4.2
 social-auth-core==4.5.4
 gitpython==3.1.44
-python-gitlab==5.4.0
+python-gitlab==5.6.0
 cpe==1.3.1
 packageurl-python==0.16.0
 django-crum==0.7.9