Test on newer macOS 13, not deprecated macOS 12 (partial cherry-pick of #21655) #21663
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The macOS-12 runners are disappearing (see #21333), and thus our CI jobs that run on the macos-12 need to stop using it.
This PR cherrypicks just that part of #21655: upgrading the test job, leaving the release jobs running on macOS 10.15 & 11.