ci: macOS resource class deprecation

[fmorency]

macOS medium resource class is being deprecated.

See https://discuss.circleci.com/t/macos-resource-deprecation-update/46891

Tests are successful. Don't mind the failed tag; my fork doesn't have access to CI secrets.

[codecov-commenter]

Codecov Report

Merging #335 (c4dd930) into main (472712f) will decrease coverage by 0.05%. The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
- Coverage   82.98%   82.94%   -0.05%     
==========================================
  Files         130      130              
  Lines       15129    15129              
==========================================
- Hits        12555    12548       -7     
- Misses       2574     2581       +7     

see 5 files with indirect coverage changes

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