ci: use macos-15-intel

[inkydragon]

The macOS-13 based runner images are being deprecated, consider switching to macOS-15 (macos-15-intel) or macOS 15 arm64 (macos-latest) instead

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.77%. Comparing base (15f7dbc) to head (d492b04).
⚠️ Report is 16 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   99.79%   99.77%   -0.03%     
==========================================
  Files           9        9              
  Lines         490      440      -50     
==========================================
- Hits          489      439      -50     
  Misses          1        1              

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