sha1-checked: bump digest to `0.11.0-pre.8` #977

Job	Run time
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	5s
build (1.71.0, thumbv7em-none-eabi)	24s
build (1.71.0, wasm32-unknown-unknown)	24s
build (stable, thumbv7em-none-eabi)	33s
build (stable, wasm32-unknown-unknown)	22s
test (1.71.0)	36s
test (stable)	26s
	3m 26s

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