Remove macos-13

[Flamefire]

Runner will be removed by 4th Dec 2025 and starts with brownouts in Nov, see: https://github.blog/changelog/2025-09-19-github-actions-macos-13-runner-image-is-closing-down

Remove from joblist

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ab9c837) to head (23656e5).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #305   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           22        22           
  Branches        12        12           
=========================================
  Hits            22        22           

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