Use MacOS runner with M1.

[tobiasraabe]

Blocked by https://github.com/actions/setup-python/issues/808.

Possible solution: https://github.com/python/peps/pull/3763

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (ad3680e) to head (043ae67).
Report is 12 commits behind head on main.

❗ Current head 043ae67 differs from pull request most recent head 71b1d52. Consider uploading reports for the commit 71b1d52 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #558   +/-   ##
=======================================
  Coverage   97.80%   97.80%           
=======================================
  Files         106      106           
  Lines        8710     8710           
=======================================
  Hits         8519     8519           
  Misses        191      191           

Flag	Coverage Δ
end_to_end	82.27% <ø> (ø)
integration	40.49% <ø> (ø)
unit	69.69% <ø> (ø)

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