Update dependency mypy to v1.12.1 (#188)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [mypy](https://www.mypy-lang.org/)
([source](https://redirect.github.com/python/mypy),
[changelog](https://mypy-lang.blogspot.com/)) | `1.12.0` -> `1.12.1` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/mypy/1.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/mypy/1.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/mypy/1.12.0/1.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/mypy/1.12.0/1.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>python/mypy (mypy)</summary>

###
[`v1.12.1`](https://redirect.github.com/python/mypy/blob/HEAD/CHANGELOG.md#Mypy-1121)

[Compare
Source](https://redirect.github.com/python/mypy/compare/v1.12.0...v1.12.1)

- Fix crash when showing partially analyzed type in error message (Ivan
Levkivskyi, PR
[17961](https://redirect.github.com/python/mypy/pull/17961))
- Fix iteration over union (when self type is involved) (Shantanu, PR
[17976](https://redirect.github.com/python/mypy/pull/17976))
- Fix type object with type var default in union context (Jukka
Lehtosalo, PR
[17991](https://redirect.github.com/python/mypy/pull/17991))
- Revert change to `os.path` stubs affecting use of `os.PathLike[Any]`
(Shantanu, PR
[17995](https://redirect.github.com/python/mypy/pull/17995))

</details>

---

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