Bump `digest` dependency to v0.11.0-pre.8 #254

Job	Run time
set-msrv / set-msrv	5s
minimal-versions / minimal-versions	28s
test (1.71.0)	29s
build (1.71.0, thumbv7em-none-eabi)	18s
test (stable)	34s
build (1.71.0, wasm32-unknown-unknown)	29s
build (stable, thumbv7em-none-eabi)	9s
build (stable, wasm32-unknown-unknown)	17s
	2m 49s

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