bcrypt-pbkdf: scrypt: bump cipher to `0.5.0-pre.4` (#489) #881

Job	Run time
minimal-versions	0s
build (1.72.0, thumbv7em-none-eabi)	19s
test (1.72.0)	22s
build (1.72.0, wasm32-unknown-unknown)	18s
test (stable)	13s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	12s
	1m 39s

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