build(deps): bump gitpython from 3.1.35 to 3.1.37 in /docs

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.35 to 3.1.37.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/main/CHANGES)
- [Commits](gitpython-developers/GitPython@3.1.35...3.1.37)

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

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

docs/requirements.txt

@@ -1,5 +1,5 @@
 furo==2023.5.20
-GitPython==3.1.35
+GitPython==3.1.37
 myst-parser==2.0.0
 Sphinx==6.2.1
 sphinx-copybutton==0.5.2