Bump `cipher` to `0.5.0-pre.4` #549

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	3m 19s
build (1.65.0, wasm32-unknown-unknown)	3m 24s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	8s
test (1.65.0)	3m 31s
test (stable)	16s
minimal-versions / minimal-versions	39s
	11m 29s

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