sha1-checked: bump digest to `0.11.0-pre.8` #203

Job	Run time
minimal-versions / minimal-versions	38s
set-msrv / set-msrv	5s
build (1.71.0, thumbv7em-none-eabi)	24s
build (1.71.0, wasm32-unknown-unknown)	19s
build (stable, thumbv7em-none-eabi)	29s
build (stable, wasm32-unknown-unknown)	20s
test (1.71.0)	26s
test (stable)	27s
	3m 8s

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