drop support for macOS 12 #4710

Job	Run time
macOS 13 (x86_64)	3h 26m 44s
macOS 14 (arm64)	1h 48m 53s
combine-standalone	12s
publish-standalone	17s
publish-standalone (-x86_64)	15s
test-standalone (macos-13)	18s
publish-standalone (-arm64)	14s
test-standalone (macos-14)	11s
test-standalone (macos-latest)	15s
test-standalone (-x86_64, macos-13)	14s
test-standalone (-x86_64, macos-14)	12s
test-standalone (-x86_64, macos-latest)	16s
test-standalone (-arm64, macos-14)	11s
test-standalone (-arm64, macos-latest)	13s
macos-check-all	1s
	5h 18m 26s

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