Bump `cipher` dependency to v0.5.0-pre.2 #751

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 49s
build (1.65.0, wasm32-unknown-unknown)	1m 48s
build (stable, thumbv7em-none-eabi)	37s
test (1.65.0)	1m 53s
build (stable, wasm32-unknown-unknown)	17s
test (stable)	22s
minimal-versions / minimal-versions	24s
	7m 10s

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