Update Rust crate rayon to 1.8.1 #729

Job	Run time
Build documentation (ubuntu-latest)	58s
Cross-compile to aarch64	1m 45s
Build and test (all features) (ubuntu-latest, 1.73)	2m 42s
Build and test core crates (ubuntu-latest, 1.73)	1m 43s
Build and test (all features) (ubuntu-latest, stable)	2m 55s
Build and test core crates (ubuntu-latest, stable)	1m 49s
Lint	50s
Build and test (all features) (macos-14, 1.73)	2m 22s
Build and test core crates (macos-14, 1.73)	1m 35s
cargo-compare extended tests (ubuntu-latest)	1m 9s
Build and test (all features) (macos-14, stable)	2m 25s
Build and test core crates (macos-14, stable)	1m 35s
cargo-compare extended tests (macos-14)	1m 12s
Build and test core crates (windows-latest, 1.73)	4m 37s
Build and test (all features) (windows-latest, 1.73)	6m 7s
Build and test (all features) (windows-latest, stable)	7m 49s
Build and test core crates (windows-latest, stable)	5m 10s
	46m 43s

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