Bump macOS GHA builds to macos-15
, default to ARM64.
#389
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GHA macOS runners are now ARM64-default, and this required a few changes to make it work.
We're almost at the release of the M4 processor, which means the Mac platform is now ~4 years into the move to ARM64, which means we need to start assuming this as the default.
I also adjusted the standard CI test to represent aarch64 as the default.
Releases have also been tested: link