chore(pre-commit): use mirror for black to use mypyc wheels

[mkniewallner]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

black releases wheels compiled with mypyc, which are faster, but by using pre-commit, we are forced to build wheels, and they are not compiled with mypyc. A mirror was recently created by one of black's maintainers, which uses a similar technic as https://github.com/pre-commit/mirrors-mypy to use mypyc-compiled wheels, making black through pre-commit faster.

[codecov]

Codecov Report

Merging #434 (c4f3a9b) into main (b044976) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #434   +/-   ##
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  Coverage   90.4%   90.4%           
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  Files         39      39           
  Lines       1084    1084           
  Branches     220     220           
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  Hits         980     980           
  Misses        89      89           
  Partials      15      15