CI - bump up to macos-latest with updated runners

[pavoljuhas]

All Python versions should be now available in the updated macos runner.

Reverts #6578
Fixes #6577

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.83%. Comparing base (2f922cd) to head (bff2288).
Report is 50 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6606   +/-   ##
=======================================
  Coverage   97.83%   97.83%           
=======================================
  Files        1077     1077           
  Lines       92502    92502           
=======================================
  Hits        90501    90501           
  Misses       2001     2001           

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[mhucka]

I looked at this error, and tried to run the failed jobs, and they're still failing. This looks like a problem with the copy of Python 3.10.15 that the setup-python action workflow is getting. FWIW, I reported the issue at actions/setup-python#948.