Bump gitpython from 3.1.32 to 3.1.34 in /docs (#551)

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.32 to 3.1.34.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/main/CHANGES)
- [Commits](gitpython-developers/GitPython@3.1.32...3.1.34)

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

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docs/requirements.txt

@@ -3,7 +3,7 @@ colcon-common-extensions==0.2.1
 colcon-mixin==0.2.0
 doc8==0.10.1
 docutils==0.16.0
-GitPython==3.1.32
+GitPython==3.1.34
 setuptools==67.6.0
 sphinx_rtd_theme==0.5.2
 sphinx-tabs==3.2.0