eax

Bump `cipher` to `0.5.0-pre.4` #743

Job	Run time
build (1.71.0, thumbv7em-none-eabi)	19s
build (1.71.0, wasm32-unknown-unknown)	15s
build (stable, thumbv7em-none-eabi)	9s
test (1.72.0)	28s
build (stable, wasm32-unknown-unknown)	1m 22s
test (stable)	53s
	3m 26s

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