Remove deprecated macOS version

[mborland]

See: https://github.blog/changelog/2025-09-19-github-actions-macos-13-runner-image-is-closing-down/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.0%. Comparing base (275e7a6) to head (4fa4fd9).
⚠️ Report is 26 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1073     +/-   ##
=========================================
- Coverage     99.0%   99.0%   -0.0%     
=========================================
  Files          253     253             
  Lines        17058   17058             
  Branches      1867    1867             
=========================================
- Hits         16872   16871      -1     
- Misses         186     187      +1     

see 1 file with indirect coverage changes

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