Fix macos-latest and 3.7 tests

[kinuax]

macos-latest (macos-14) was migrated to ARM runner, stopping support for Python 3.7. CI is updated accordingly.

To be considered before #154

Context: actions/setup-python#856

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.29%. Comparing base (2aea99d) to head (ae5666f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   96.29%   96.29%           
=======================================
  Files           8        8           
  Lines         729      729           
  Branches      111      111           
=======================================
  Hits          702      702           
  Misses         21       21           
  Partials        6        6           

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