cmpv2

Bump `rand` to v0.10.0-rc.8 #2790

Job	Run time
test (stable)	6m 57s
build (1.85.0, thumbv7em-none-eabi)	52s
test (1.85.0)	7m 10s
build (stable, thumbv7em-none-eabi)	50s
build (stable, wasm32-unknown-unknown)	55s
build (1.85.0, wasm32-unknown-unknown)	47s
minimal-versions	0s
	17m 31s

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