Update MacOS arm jobs in ci to MacOS 26

[mcbarton]

Description

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Fixes # (issue)

Type of change

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• Bug fix
• New feature
• Requires documentation updates

Testing

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Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.03%. Comparing base (e1e07e0) to head (ca64c89).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #728   +/-   ##
=======================================
  Coverage   81.03%   81.03%           
=======================================
  Files           9        9           
  Lines        4214     4214           
=======================================
  Hits         3415     3415           
  Misses        799      799           

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