Update dependency GitPython to v3.1.31 (#56)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [GitPython](https://togithub.com/gitpython-developers/GitPython) |
`==3.1.30` -> `==3.1.31` |
[![age](https://badges.renovateapi.com/packages/pypi/GitPython/3.1.31/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/pypi/GitPython/3.1.31/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/pypi/GitPython/3.1.31/compatibility-slim/3.1.30)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/pypi/GitPython/3.1.31/confidence-slim/3.1.30)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>gitpython-developers/GitPython</summary>

###
[`v3.1.31`](https://togithub.com/gitpython-developers/GitPython/compare/3.1.30...3.1.31)

[Compare
Source](https://togithub.com/gitpython-developers/GitPython/compare/3.1.30...3.1.31)

</details>

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requirements.txt

@@ -2,7 +2,7 @@
 aiofiles==23.1.0
 black==23.1.0
 coverage==7.1.0
-GitPython==3.1.30
+GitPython==3.1.31
 mypy==1.0.0
 nest_asyncio==1.5.6
 pdoc==12.3.1