mgm

Bump `cipher` to `0.5.0-pre.4` #701

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 27s
build (1.56.0, wasm32-unknown-unknown)	3m 23s
test (1.56.0)	3m 34s
build (stable, thumbv7em-none-eabi)	32s
test (stable)	25s
build (stable, wasm32-unknown-unknown)	19s
	11m 40s

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