Bump `digest` dependency to v0.11.0-pre.8 #941

Job	Run time
set-msrv / set-msrv	9s
minimal-versions / minimal-versions	28s
build (1.71.0, thumbv7em-none-eabi)	19s
build (1.71.0, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	17s
test (1.71.0)	36s
test (stable)	22s
	2m 43s

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