Bump `cipher` dependency to v0.5.0-pre.2 #921

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	31s
build (1.72.0, wasm32-unknown-unknown)	32s
build (stable, thumbv7em-none-eabi)	23s
build (stable, wasm32-unknown-unknown)	30s
aesni (i686-unknown-linux-gnu, 1.72.0, sudo apt update && sudo apt install gcc-multilib)	39s
armv8 (aarch64-unknown-linux-gnu, 1.72.0)	48s
autodetect (i686-unknown-linux-gnu, 1.72.0, sudo apt update && sudo apt install gcc-multilib)	43s
aesni (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	31s
autodetect (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	38s
aesni (x86_64-unknown-linux-gnu, 1.72.0)	23s
clippy	18s
autodetect (x86_64-unknown-linux-gnu, 1.72.0)	25s
aesni (x86_64-unknown-linux-gnu, stable)	14s
autodetect (x86_64-unknown-linux-gnu, stable)	21s
cross (aarch64-unknown-linux-gnu, 1.72.0)	1m 11s
soft (i686-unknown-linux-gnu, 1.72.0, sudo apt update && sudo apt install gcc-multilib)	35s
cross (aarch64-unknown-linux-gnu, stable)	1m 1s
soft (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	33s
cross (powerpc-unknown-linux-gnu, 1.72.0)	1m 15s
soft (x86_64-unknown-linux-gnu, 1.72.0)	18s
cross (powerpc-unknown-linux-gnu, stable)	1m 8s
soft (x86_64-unknown-linux-gnu, stable)	15s
minimal-versions / minimal-versions	34s
	13m 46s

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