Bump `cipher` to v0.5.0-pre.7 #57

Job	Run time
build (1.71.0, thumbv7em-none-eabi)	16s
minimal-versions	0s
build (1.71.0, wasm32-unknown-unknown)	15s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	15s
test (1.71.0)	15s
test (stable)	17s
	1m 29s

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