mgm

Bump `cipher` to `0.5.0-pre.4` #711

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 33s
test (1.56.0)	3m 46s
build (1.56.0, wasm32-unknown-unknown)	3m 25s
build (stable, thumbv7em-none-eabi)	9s
test (stable)	17s
build (stable, wasm32-unknown-unknown)	27s
	11m 37s

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