Update dependency pip to v23.2.1 (#289)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pip](https://pip.pypa.io/) ([source](https://togithub.com/pypa/pip),
[changelog](https://pip.pypa.io/en/stable/news/)) | `==23.2` ->
`==23.2.1` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pip/23.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pip/23.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pip/23.2/23.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pip/23.2/23.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>pypa/pip (pip)</summary>

### [`v23.2.1`](https://togithub.com/pypa/pip/compare/23.2...23.2.1)

[Compare Source](https://togithub.com/pypa/pip/compare/23.2...23.2.1)

</details>

---

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requirements.txt

@@ -6,7 +6,7 @@ GitPython==3.1.32
 mypy==1.4.1
 nest_asyncio==1.5.6
 pdoc==14.0.0
-pip==23.2
+pip==23.2.1
 pre-commit==3.3.3
 pydantic==2.0.3
 pytest==7.4.0