Use `macos-12` to build release wheels #5482

Job	Run time
build binary \| linux	1m 30s
build binary \| macos aarch64	4m 53s
build binary \| macos x86_64	1m 59s
build binary \| windows	4m 6s
cargo clippy \| ubuntu	3m 33s
cargo fmt	24s
cargo test \| ubuntu	3m 59s
cargo clippy \| windows	4m 5s
cargo test \| windows	7m 37s
check windows trampoline	3m 49s
cargo test \| macos	10m 30s
check system \| alpine	26s
check cache \| ubuntu	45s
ecosystem test \| prefecthq/prefect	1m 55s
check system \| amazonlinux	32s
ecosystem test \| pallets/flask	10s
check system \| python on debian	57s
check system \| python on fedora	31s
check system \| python on opensuse	35s
check system \| python via pyenv	1m 45s
check system \| pypy on ubuntu	29s
check system \| pyston	4m 6s
check system \| python on rocky linux 8	29s
check system \| python on ubuntu	15s
check system \| python on rocky linux 9	26s
check system \| python3.13 on windows	1m 24s
check system \| python3.10 on windows	59s
check system \| python3.12 via chocolatey	2m 9s
check system \| embedded python3.10 on windows	42s
check system \| python3.10 on windows x86	50s
check system \| homebrew python on macos aarch64	19s
check cache \| macos aarch64	14s
check system \| conda3.8 on linux	38s
check system \| python on macos aarch64	15s
check system \| conda3.11 on linux	40s
check system \| conda3.8 on windows	2m 53s
check system \| conda3.11 on windows	3m 2s
check system \| conda3.8 on macos	50s
check system \| conda3.11 on macos	42s
check system \| python on macos x86_64	36s
	1h 15m 59s

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