mgm

Bump `cipher` to `0.5.0-pre.4` #717

Job	Run time
test (1.56.0)	54s
build (1.56.0, thumbv7em-none-eabi)	38s
test (stable)	15s
build (1.56.0, wasm32-unknown-unknown)	44s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	8s
	2m 47s

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