Switch to mypy-dev 1.18.0a6

[cdce8p]

Description

Mypy itself has a rather slow release cadences. A while ago I created mypy-dev. A repository setup to create development releases of mypy available on PyPI. Initially it was only really intended for use during the Home Assistant development. Today, I also setup a pre-commit mirror at mypy-dev-pre-commit so we could also use it here in pylint.

It wouldn't be worth it here usually, but I recently fixed a few mypy issues with the match statement which would be useful here. Once the next version is released, we could switch back again.

• Remove unnecessary error message for match class patterns python/mypy#19708
• Omit errors for class pattern matches against object python/mypy#19709
• Fix unwrapping assignment expressions in match subject python/mypy#19742

Note

Due to the increased release frequency and storage limits, I delete old versions on PyPI from time to time.
At most this would probably mean the mypy pre-commit check would fail if an old commit is checked out at some point. For the main branch pre-commit autoupdate should work fine.

I'd also recommend that the maintenance branch doesn't switch to mypy-dev since autoupdate isn't run there.

Resolves #10514 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.84%. Comparing base (e843e53) to head (1a536bd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10527   +/-   ##
=======================================
  Coverage   95.84%   95.84%           
=======================================
  Files         177      177           
  Lines       19284    19284           
=======================================
  Hits        18483    18483           
  Misses        801      801           

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[Pierre-Sassoulas]

The kind of edginess I can get behind.