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<https://github.com/pantsbuild/pants/issues/21413|#21413 Upgrade CI to build on macOS 12>
Issue created by <https://github.com/huonw|huonw>
*Is your feature request related to a problem? Please describe.*

In <https://github.com/pantsbuild/pants/issues/21074|#21074> / <https://github.com/pantsbuild/pants/pull/21326|#21326>, we deprecated running on macOS 11 and earlier, in favour of macOS 12. We should upgrade our CI to match this:

• for x86-64, we could upgrade to Github-hosted runners although there's the impending removal of those <https://github.com/pantsbuild/pants/issues/21333|#21333>
• for arm64, we'd need to do an OS upgrade on our existing self-hosted runner because GitHub only provides macOS 14 hosted runners

*Additional context*

Related issues/PRs:

• <https://github.com/pantsbuild/pants/pull/21003|#21003>
• <https://github.com/pantsbuild/pants/issues/21074|#21074>
• <https://github.com/pantsbuild/pants/pull/21326|#21326>
• <https://github.com/pantsbuild/pants/issues/21333|#21333>
<https://github.com/pantsbuild/pants|pantsbuild/pants>