Bump gitpython from 3.1.18 to 3.1.30 in /scripts/ci (microsoft#11386)

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.18 to 3.1.30.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/main/CHANGES)
- [Commits](gitpython-developers/GitPython@3.1.18...3.1.30)

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

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scripts/ci/requirements.txt

@@ -1,2 +1,2 @@
 pygithub==1.55
-gitpython==3.1.18
+gitpython==3.1.30