Try using macos-latest for CI builds

[MikePopoloski]

Bumps the runner to macos-14

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.70%. Comparing base (8637e2e) to head (a61f287).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1030   +/-   ##
=======================================
  Coverage   94.70%   94.70%           
=======================================
  Files         191      191           
  Lines       47569    47597   +28     
=======================================
+ Hits        45048    45078   +30     
+ Misses       2521     2519    -2     

Files	Coverage Δ
include/slang/util/Util.h	90.90% <ø> (ø)

... and 6 files with indirect coverage changes

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