Update mypy to 1.12.1

[pyup-bot]

This PR updates mypy from 1.12.0 to 1.12.1.

Changelog

1.12.1

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

Acknowledgements
Thanks to all mypy contributors who contributed to this release:

- Ali Hamdan
- Anders Kaseorg
- Bénédikt Tran
- Brian Schubert
- bzoracler
- Chelsea Durazo
- Danny Yang
- Edgar Ramírez Mondragón
- Eric Mark Martin
- InSync
- Ivan Levkivskyi
- Jordandev678
- Katrina Connors
- Kirill Podoprigora
- Marc Mueller
- Max Muoto
- Max Murin
- Michael Carlstrom
- Michael I Chen
- Pradyun Gedam
- quinn-sasha
- Raphael Krupinski
- Sebastian Rittau
- Shantanu
- sobolevn
- Soubhik Kumar Mitra
- Stanislav Terliakov
- wyattscarpenter

I’d also like to thank my employer, Dropbox, for supporting mypy development.

Links

• PyPI: https://pypi.org/project/mypy
• Changelog: https://data.safetycli.com/changelogs/mypy/
• Homepage: https://www.mypy-lang.org/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.47%. Comparing base (6a77355) to head (e63a6f2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2164   +/-   ##
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  Coverage   81.47%   81.47%           
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  Files          77       77           
  Lines        9500     9500           
  Branches     1148     1148           
=======================================
  Hits         7740     7740           
  Misses       1569     1569           
  Partials      191      191           

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