ci: macOS job - use Xcode 15

[battlmonstr]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.15%. Comparing base (3d35188) to head (f9e12de).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1929      +/-   ##
==========================================
- Coverage   53.16%   53.15%   -0.01%     
==========================================
  Files         610      610              
  Lines       45725    45725              
  Branches     7038     7038              
==========================================
- Hits        24310    24307       -3     
- Misses      19298    19300       +2     
- Partials     2117     2118       +1     

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[canepat]

It's OK for me to bump the Xcode version in CI job, but I would pair this change with a proper fix for the build regression introduced by #1926 surrounding add_link_options with a check on compiler version:

  if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 15)
    # https://stackoverflow.com/questions/77164140/
    add_link_options(-Wl,-no_warn_duplicate_libraries)
  endif()

[battlmonstr]

@canepat 👌 implemented here: #1928

It's OK for me to bump the Xcode version in CI job, but I would pair this change with a proper fix for the build regression introduced by #1926 surrounding add_link_options with a check on compiler version:

  if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 15)
    # https://stackoverflow.com/questions/77164140/
    add_link_options(-Wl,-no_warn_duplicate_libraries)
  endif()