md2

Bump `digest` dependency to v0.11.0-pre.8 #934

Job	Run time
minimal-versions / minimal-versions	43s
set-msrv / set-msrv	2s
test (1.71.0)	49s
build (1.71.0, thumbv7em-none-eabi)	23s
test (stable)	41s
build (1.71.0, wasm32-unknown-unknown)	19s
build (stable, thumbv7em-none-eabi)	27s
build (stable, wasm32-unknown-unknown)	17s
	3m 41s

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