chore(deps): update dependency pydantic to v2.6.4 (#583)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pydantic](https://github.com/pydantic/pydantic)
([changelog](https://docs.pydantic.dev/latest/changelog/)) | `==2.6.3`
-> `==2.6.4` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pydantic/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pydantic/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pydantic/2.6.3/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pydantic/2.6.3/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>pydantic/pydantic (pydantic)</summary>

###
[`v2.6.4`](https://github.com/pydantic/pydantic/blob/HEAD/HISTORY.md#v264-2024-03-12)

[Compare
Source](https://github.com/pydantic/pydantic/compare/v2.6.3...v2.6.4)

[GitHub
release](https://github.com/pydantic/pydantic/releases/tag/v2.6.4)

##### What's Changed

##### Fixes

- Fix usage of `AliasGenerator` with `computed_field` decorator by
[@&#8203;sydney-runkle](https://github.com/sydney-runkle) in
[#&#8203;8806](https://github.com/pydantic/pydantic/pull/8806)
- Fix nested discriminated union schema gen, pt 2 by
[@&#8203;sydney-runkle](https://github.com/sydney-runkle) in
[#&#8203;8932](https://github.com/pydantic/pydantic/pull/8932)
- Fix bug with no_strict_optional=True caused by API deferral by
[@&#8203;dmontagu](https://github.com/dmontagu) in
[#&#8203;8826](https://github.com/pydantic/pydantic/pull/8826)

</details>

---

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requirements.txt

@@ -7,7 +7,7 @@ nest_asyncio==1.6.0
 pdoc==14.4.0
 pip==24.0
 pre-commit==3.6.2
-pydantic==2.6.3
+pydantic==2.6.4
 pytest==8.1.1
 pytest-asyncio==0.23.5.post1
 pytest-cov==4.1.0