Use GitHub-hosted macos-12 in CI, not deprecated macos-11 (Cherry-pick of #21003) #21008
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GitHub Actions has deprecated their
macos-11
hosted runners, and removing them at the end of the month. This thus bumps tomacos-12
, the oldest supported version.https://github.blog/changelog/2024-05-20-actions-upcoming-changes-to-github-hosted-macos-runners/
This cherry-picks to all active branches to ensure their CI continues to work.
Fixes #20938