Bump `cipher` to `0.5.0-pre.4` #745

Job	Run time
build (1.71.0, thumbv7em-none-eabi)	21s
build (1.71.0, wasm32-unknown-unknown)	17s
test (1.72.0)	24s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	10s
test (stable)	1m 13s
	2m 33s

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