Bump gitpython from 3.1.31 to 3.1.35 in /extra_requirements

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.31 to 3.1.35.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/main/CHANGES)
- [Commits](gitpython-developers/GitPython@3.1.31...3.1.35)

---
updated-dependencies:
- dependency-name: gitpython
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

extra_requirements/requirements-docs.txt

@@ -1,7 +1,7 @@
 # File for the requirements of the documentation
 autodocsumm==0.2.7
 commonmark==0.9.1
-gitpython==3.1.31
+gitpython==3.1.35
 graphviz==0.19.1
 m2r==0.2.1
 nbsphinx==0.8.9