bcrypt-pbkdf: scrypt: bump cipher to `0.5.0-pre.4` (#489) #873

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	16s
build (1.72.0, wasm32-unknown-unknown)	16s
minimal-versions	0s
build (stable, thumbv7em-none-eabi)	15s
test (1.72.0)	17s
build (stable, wasm32-unknown-unknown)	12s
test (stable)	21s
	1m 37s

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