cbc

bump dependency of `cipher` to `0.5.0-pre.4` #139

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 33s
build (1.56.0, wasm32-unknown-unknown)	3m 27s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	10s
test (1.56.0)	3m 42s
test (stable)	10s
minimal-versions / minimal-versions	12s
	11m 26s

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