Bump `digest` dependency to v0.11.0-pre.8 #310

Job	Run time
minimal-versions / minimal-versions	27s
set-msrv / set-msrv	2s
test (1.71.0)	35s
build (1.71.0, thumbv7em-none-eabi)	21s
test (stable)	23s
build (1.71.0, wasm32-unknown-unknown)	18s
build (stable, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	13s
	2m 36s

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