Bump gitpython from 3.1.26 to 3.1.30 in /docs

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.26 to 3.1.30.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/main/CHANGES)
- [Commits](gitpython-developers/GitPython@3.1.26...3.1.30)

---
updated-dependencies:
- dependency-name: gitpython
  dependency-type: direct:production
...

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

docs/requirements_mac.txt

@@ -4,7 +4,7 @@ certifi==2021.10.8
 charset-normalizer==2.0.11
 docutils==0.17.1
 gitdb==4.0.9
-GitPython==3.1.26
+GitPython==3.1.30
 idna==3.3
 imagesize==1.3.0
 importlib-metadata==4.11.0