Bump python-gitlab from 3.15.0 to 4.3.0

Bumps [python-gitlab](https://github.com/python-gitlab/python-gitlab) from 3.15.0 to 4.3.0.
- [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@v3.15.0...v4.3.0)

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

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

requirements.txt

@@ -2,7 +2,7 @@ docopt==0.6.2
 Flask==3.0.0
 Flask-Cors==4.0.0
 pyaml==23.9.5
-python-gitlab==3.15.0
+python-gitlab==4.3.0
 rdflib==7.0.0
 requests==2.31.0
 SPARQLTransformer==2.3.0