Partial migration to `rand_core` v0.9 #2340

Job	Run time
minimal-versions	0s
no_std (1.81.0, thumbv7em-none-eabi)	14s
no_std (1.81.0, wasm32-unknown-unknown)	12s
test (1.81.0)	12s
no_std (stable, thumbv7em-none-eabi)	11s
test (stable)	18s
no_std (stable, wasm32-unknown-unknown)	7s
	1m 14s

Provide feedback