bcrypt-pbkdf: scrypt: bump cipher to `0.5.0-pre.4` (#496) #888

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	21s
build (1.72.0, wasm32-unknown-unknown)	1m 34s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	28s
test (1.72.0)	38s
test (stable)	59s
minimal-versions	0s
	4m 19s

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