chore: Release rustix version 0.38.18 #3398

Job	Run time
Rustfmt	15s
Check nightly-only targets (nightly)	32s
Check (stable)	8m 3s
Check selected Tier 3 platforms (nightly)	4m 21s
Check --no-default-features (nightly)	1m 12s
Check (nightly)	10m 20s
Check (1.63)	15m 42s
Test use-libc (ubuntu)	1m 8s
Test (ubuntu)	1m 31s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 31s
Test (ubuntu-20.04)	1m 16s
Test use-libc (i686-linux)	1m 33s
Test use-libc (aarch64-linux)	1m 50s
Test (i686-linux)	1m 24s
Test use-libc (powerpc64le-linux)	1m 35s
Test (aarch64-linux)	1m 49s
Test use-libc (riscv64-linux)	1m 37s
Test (powerpc64le-linux)	1m 30s
Test use-libc (arm-linux)	1m 36s
Test (riscv64-linux)	1m 31s
Test (s390x-linux)	1m 42s
Test (arm-linux)	1m 45s
Test (ubuntu-stable)	1m 6s
Test (i686-linux-stable)	1m 31s
Test (aarch64-linux-stable)	1m 36s
Test (riscv64-linux-stable)	1m 31s
Test (s390x-linux-stable)	1m 39s
Test (powerpc64le-linux-stable)	1m 33s
Test (arm-linux-stable)	1m 33s
Test (ubuntu-1.63)	4m 45s
Test (i686-linux-1.63)	5m 9s
Test (aarch64-linux-1.63)	5m 24s
Test (riscv64-linux-1.63)	5m 19s
Test (s390x-linux-1.63)	6m 57s
Test (powerpc64le-linux-1.63)	7m 16s
Test (arm-linux-1.63)	5m 13s
Test (macos-latest)	1m 56s
Test (macos-11)	1m 20s
Test (windows)	1m 5s
Test (windows-2019)	1m 22s
	1h 59m 58s

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