Bump `cipher` to v0.5.0-pre.6; `digest` to v0.11.0-pre.9 (#165) #304

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	14s
test (1.72.0)	26s
build (1.72.0, wasm32-unknown-unknown)	16s
test (stable)	19s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	15s
minimal-versions / minimal-versions	38s
	2m 23s

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