Rust

Bump to version 3.20.2 (#312) #339

Job	Run time
miri	4m 25s
build (nightly, --all-features)	50s
build (1.73.0, --features collections,boxed)	56s
build (stable, --no-default-features)	36s
build (stable, --features collections,boxed)	39s
valgrind	2m 22s
fmt	17s
benches	24s
build (beta, --features collections,boxed)	40s
	11m 9s

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