Bump gitpython from 3.1.7 to 3.1.17 in /requirements

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.7 to 3.1.17.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/main/CHANGES)
- [Commits](gitpython-developers/GitPython@3.1.7...3.1.17)

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