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

Please describe the test(s) that you added and ran to verify your changes.

Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.39%. Comparing base (5f25366) to head (2307439).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #728      +/-   ##
==========================================
- Coverage   79.83%   79.39%   -0.45%     
==========================================
  Files           9        9              
  Lines        3963     3780     -183     
==========================================
- Hits         3164     3001     -163     
+ Misses        799      779      -20     

see 8 files with indirect coverage changes
see 8 files with indirect coverage changes

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