Rust

Update Rust crate rayon to 1.8.1 #494

Job	Run time
build-docker (1.63, x86_64-unknown-freebsd)	1m 33s
build-docker (stable, x86_64-unknown-freebsd)	2m 3s
build-unix (1.63, ubuntu)	2m 36s
build-docker (nightly, x86_64-unknown-freebsd)	1m 52s
build-windows (i686, msvc, 1.63)	5m 11s
build-unix (1.63, macos)	5m 34s
build-unix (stable, ubuntu)	31s
build-windows (i686, msvc, stable)	6m 49s
build-windows (i686, msvc, nightly)	1m 30s
build-unix (stable, macos)	1m 16s
build-windows (x86_64, msvc, 1.63)	3m 51s
build-unix (nightly, ubuntu)	45s
build-windows (x86_64, msvc, stable)	2m 50s
build-unix (nightly, macos)	1m 0s
build-windows (x86_64, msvc, nightly)	1m 23s
build-windows (aarch64, msvc, 1.63)	5m 10s
build-windows (aarch64, msvc, stable)	2m 33s
build-windows (aarch64, msvc, nightly)	3m 2s
	49m 29s

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