Update Rust crate rayon to 1.8.0 #366

Job	Run time
Cross-compile to aarch64	3m 10s
Build and test (all features) (ubuntu-latest, 1.66)	4m 37s
Build and test core crates (ubuntu-latest, 1.66)	3m 37s
Build documentation (ubuntu-latest)	1m 44s
Build and test (all features) (ubuntu-latest, stable)	4m 2s
Lint	1m 3s
Build and test core crates (ubuntu-latest, stable)	2m 45s
Build and test (all features) (macos-latest, 1.66)	4m 28s
Build and test core crates (macos-latest, 1.66)	5m 7s
Build and test (all features) (macos-latest, stable)	5m 18s
cargo-compare extended tests (ubuntu-latest)	1m 46s
Build and test core crates (macos-latest, stable)	3m 43s
cargo-compare extended tests (macos-latest)	3m 48s
Build and test (all features) (windows-latest, 1.66)	10m 14s
Build and test core crates (windows-latest, 1.66)	7m 12s
Build and test (all features) (windows-latest, stable)	10m 59s
Build and test core crates (windows-latest, stable)	6m 56s
	1h 20m 29s

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