Bump gitpython from 3.1.31 to 3.1.32 in /extra_requirements (#121)

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.31 to 3.1.32.
- [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...3.1.32)

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

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extra_requirements/requirements-tests.txt

@@ -3,7 +3,7 @@ astropy==5.2.1; python_version>'3.7'
 coverage==6.5.0
 coveralls==3.3.1
 galpy==1.8.2
-gitpython==3.1.31
+gitpython==3.1.32
 latex==0.7.0
 ipywidgets==8.1.0
 matplotlib==3.5.3; python_version<='3.7'