chore(python): bump pygithub from 2.2.0 to 2.3.0 in /docs

Bumps [pygithub](https://github.com/pygithub/pygithub) from 2.2.0 to 2.3.0.
- [Release notes](https://github.com/pygithub/pygithub/releases)
- [Changelog](https://github.com/PyGithub/PyGithub/blob/main/doc/changes.rst)
- [Commits](PyGithub/PyGithub@v2.2.0...v2.3.0)

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

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

docs/requirements.txt

@@ -11,4 +11,4 @@ mkdocs-macros-plugin==1.0.4
 mkdocs-redirects==1.2.1
 material-plausible-plugin==0.2.0
 markdown-exec[ansi]==1.8.0
-PyGithub==2.2.0
+PyGithub==2.3.0