Bump `crypto-primes` to v0.7.0-pre.8 (#645) #1209

Job	Run time
nightly	1m 5s
test (stable)	4m 7s
test (1.85.0)	4m 23s
build (stable, wasm32-unknown-unknown)	26s
build (1.85.0, thumbv7em-none-eabi)	26s
build (1.85.0, wasm32-unknown-unknown)	26s
minimal-versions	0s
build (stable, thumbv7em-none-eabi)	25s
	11m 18s

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