Fix broken GitHub Action due to GitHub update

[rly]

The error was The version '3.7' with architecture 'arm64' was not found for macOS 14.4.1. GitHub recently updated the macos-latest environment to macos-14-arm64, and Python 3.9 and earlier aren't available there.

Checklist

• Did you update CHANGELOG.md with your changes?
• Does the PR clearly describe the problem and the solution?
• Have you reviewed our Contributing Guide?
• Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.87%. Comparing base (7489909) to head (6a1a51f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   82.87%   82.87%           
=======================================
  Files           2        2           
  Lines         146      146           
  Branches       32       32           
=======================================
  Hits          121      121           
  Misses         20       20           
  Partials        5        5           

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