Try revive macos-latest build -- fails for pybind code

[Hackerman342]

Attempt at reviving the ability to pip install on a macos-latest runner. Spun off from #169, which was split into two so we can separate the #170 from the more difficult problem of reviving the macos build.

[Hackerman342]

Check the action output for the error for the latest attempt, but it seems to me the issue is the macos-latest action is using clang, despite attempts to force the use of gcc. This causes a failure due to the -fconcepts build arg

      error: command '/usr/bin/gcc' failed with exit code 1
      clang: error: unknown argument: '-fconcepts'
      clang: error: unknown argument: '-fconcepts'
      [end of output]

[ethanrublee]

@Hackerman342 this now builds and tests pass on mac for the python code.

[Hackerman342]

Awesome!