Update CI to macos-13. #4424

Job	Run time
Check (stable)	6m 4s
Check (nightly)	6m 3s
Check --no-default-features (nightly)	56s
Check selected Tier 3 platforms (nightly)	4m 56s
Check (1.63)	10m 17s
Check nightly-only targets (nightly)	22s
Rustfmt	11s
Test use-libc (ubuntu)	44s
Test use-libc (i686-linux)	1m 3s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 5s
Test use-libc (aarch64-linux)	1m 8s
Test rustix_use_experimental_asm (s390x-linux)	1m 10s
Test use-libc (powerpc64le-linux)	1m 7s
Test use-libc (riscv64-linux)	1m 3s
Test use-libc (s390x-linux)	1m 12s
Test use-libc (arm-linux)	1m 9s
	38m 30s

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