Rust

Update Rust crate rayon to 1.8.1 #496

Job	Run time
build-docker (1.63, x86_64-unknown-freebsd)	1m 51s
build-unix (1.63, ubuntu)	2m 39s
build-docker (stable, x86_64-unknown-freebsd)	1m 40s
build-windows (i686, msvc, 1.63)	3m 45s
build-unix (1.63, macos)	4m 24s
build-docker (nightly, x86_64-unknown-freebsd)	1m 47s
build-windows (i686, msvc, stable)	2m 54s
build-unix (stable, ubuntu)	33s
build-unix (stable, macos)	43s
build-unix (nightly, ubuntu)	33s
build-windows (i686, msvc, nightly)	1m 39s
build-unix (nightly, macos)	51s
build-windows (x86_64, msvc, 1.63)	3m 48s
build-windows (x86_64, msvc, stable)	2m 41s
build-windows (x86_64, msvc, nightly)	1m 26s
build-windows (aarch64, msvc, 1.63)	3m 38s
build-windows (aarch64, msvc, stable)	1m 57s
build-windows (aarch64, msvc, nightly)	1m 3s
	37m 52s

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