Bump `cipher` dependency to v0.5.0-pre.2 #721

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 47s
build (1.65.0, wasm32-unknown-unknown)	1m 48s
build (stable, thumbv7em-none-eabi)	20s
test (1.65.0)	2m 9s
build (stable, wasm32-unknown-unknown)	10s
test (stable)	28s
minimal-versions / minimal-versions	41s
	7m 23s

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