CI: Remove MacOS latest xlarge runner

[ErichSuter]

Resolves #1186

[mferrera]

Not sure what the correct combo is; may need to play around with it a few times

[mferrera]

Suggested change

	- [macos-latest, macosx_x86_64]
	- [macos-latest, macosx_x86_64]
	- [macos-latest, macosx_arm64]

I think the issue I wrote was misleading here... we still need to build for arm64, we just don't want to do it with the xlarge runner. This might take a few tries futzing with GitHub CI for it to work. It might also still need to exclude python 3.9... but we should try again without excluding it

[mferrera]

👍 Looks good to go.

Don't worry about the two hanging jobs. In repository settings we have marked CIBW Python cp39 on macos-latest and CIBW Python cp39 on windows-latest as required... but because of the name change

name: CIBW Python ${{ matrix.cibw_python }} on ${{ matrix.os_arch[0] }}-${{ matrix.os_arch[1] }}

these jobs no longer exist. They were replaced by CIBW Python cp39 on macos-latest-macosx_x86_64 and CIBW Python cp39 on windows-latest-win_amd64. Another fun quirk of working with actions: they won't be run at all, but GitHub can't tell that they never will be, so it will wait and expect them to start for x hours.

These can only be adjusted in the repository settings after the PR is merged; I'll take care of it.

[mferrera]

(You may not have been able to bypass the merge requirements so I took it in)

[ErichSuter]

OK, thanks :-)