eax

Bump `cipher` to `0.5.0-pre.4` #707

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 24s
test (1.56.0)	3m 23s
build (1.56.0, wasm32-unknown-unknown)	3m 27s
test (stable)	24s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	9s
	11m 0s

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