Bump macos runner from 11 to 12

[tinaboyce]

Closes #1302

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.19%. Comparing base (99d6fe4) to head (a2d7f3c).
Report is 24 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1304   +/-   ##
=======================================
  Coverage   42.19%   42.19%           
=======================================
  Files          54       54           
  Lines        6456     6456           
=======================================
  Hits         2724     2724           
  Misses       3283     3283           
  Partials      449      449           

Flag	Coverage Δ
unittests	42.19% <ø> (ø)

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[mapkon]

Thanks @tinaboyce - I think @charlottecampbell193 was working on this.

[tinaboyce]

Oops, my bad, I didn't see the discussion until now.