Bump `cipher` to v0.5.0-pre.7 #309

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	24s
build (1.72.0, wasm32-unknown-unknown)	16s
test (1.72.0)	21s
build (stable, thumbv7em-none-eabi)	15s
test (stable)	14s
build (stable, wasm32-unknown-unknown)	18s
minimal-versions / minimal-versions	29s
	2m 17s

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