action: upgrade macos to 12 #3011

Job	Run time
contrib-build (amd64)	20s
contrib-lint (contrib/nydusify)	10s
contrib-build (arm64)	43s
contrib-unit-test-coverage	1m 33s
contrib-lint (contrib/ctr-remote)	13s
contrib-build (ppc64le)	47s
nydus-build (amd64)	2m 11s
contrib-lint (contrib/nydus-overlayfs)	9s
contrib-build (riscv64)	57s
nydus-build (arm64)	2m 29s
nydus-build (ppc64le)	2m 19s
cargo-deny	44s
nydus-build (riscv64)	2m 15s
nydusd-build-macos (amd64)	6m 26s
nydus-unit-test	4m 47s
nydusd-build-macos (arm64)	6m 36s
nydus-unit-test-coverage	3m 59s
takeover-test	1m 34s
nydus-integration-test	5m 54s
performance-test (fs-version-5)	1m 25s
performance-test (fs-version-6)	1m 42s
performance-test (zran)	1m 10s
upload-coverage-to-codecov	13s
	48m 36s

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