Update CI runner OS versions

[BenFordTytherington]

Fix for #1079

• MacOs 14 is now being used (most recent stable version)
• Ubuntu-24.04 is now being used (most recent stable version)
• Actions previously using ubuntu-latest have been pinned to 24.04

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (main@9e4072b). Learn more about missing BASE report. Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #1097   +/-   ##
========================================
  Coverage        ?   100.00%           
========================================
  Files           ?        71           
  Lines           ?     12108           
  Branches        ?         0           
========================================
  Hits            ?     12108           
  Misses          ?         0           
  Partials        ?         0           

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