Use macos-15-intel

[christiangnrd]

macos 13 images are going away soon so replace the Intel runners with macos-15-intel runners.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.01%. Comparing base (f429185) to head (ab9d529).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #375   +/-   ##
=======================================
  Coverage   79.01%   79.01%           
=======================================
  Files          12       12           
  Lines         672      672           
=======================================
  Hits          531      531           
  Misses        141      141           

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[maleadt]

Thanks! Sadly, still many of the same hangs, but of course it wasn't expected that this PR would help that.