Bump `digest` to v0.11.0-pre.9 #1001

Job	Run time
minimal-versions / minimal-versions	35s
set-msrv / set-msrv	2s
test (1.71.0)	36s
build (1.71.0, thumbv7em-none-eabi)	20s
test (stable)	32s
build (1.71.0, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	19s
	3m 2s

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