Bump pygithub from 2.8.1 to 2.9.1

Bumps [pygithub](https://github.com/pygithub/pygithub) from 2.8.1 to 2.9.1.
- [Release notes](https://github.com/pygithub/pygithub/releases)
- [Changelog](https://github.com/PyGithub/PyGithub/blob/main/doc/changes.rst)
- [Commits](PyGithub/PyGithub@v2.8.1...v2.9.1)

---
updated-dependencies:
- dependency-name: pygithub
  dependency-version: 2.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -6,6 +6,6 @@ python-gitlab==8.2.0
 rdflib==7.6.0
 requests==2.33.1
 SPARQLTransformer==2.4.0
-PyGithub==2.8.1
+PyGithub==2.9.1
 gunicorn==25.1.0; sys_platform!="win32"
 waitress>=1.4.2; sys_platform=="win32"