[chore] Bump macOS runners to macos-14

[pellared]

Per https://github.blog/changelog/2024-05-20-actions-upcoming-changes-to-github-hosted-macos-runners/

Will unblock other PRs e.g. #3314

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3315   +/-   ##
=======================================
  Coverage        ?   78.98%           
=======================================
  Files           ?       88           
  Lines           ?     3403           
  Branches        ?        0           
=======================================
  Hits            ?     2688           
  Misses          ?      641           
  Partials        ?       74           

Flag	Coverage Δ
Linux	80.04% <ø> (?)
Windows	75.22% <ø> (?)
macOS	76.07% <ø> (?)

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