Bump `digest` to v0.11.0-pre.9 #631

Job	Run time
minimal-versions / minimal-versions	43s
set-msrv / set-msrv	3s
build (1.71.0, thumbv7em-none-eabi)	25s
build (1.71.0, wasm32-unknown-unknown)	30s
build (stable, thumbv7em-none-eabi)	23s
build (stable, wasm32-unknown-unknown)	22s
test (1.71.0)	42s
test (stable)	43s
	3m 51s

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