Bump `digest` to v0.11.0-pre.9 #1003

Job	Run time
minimal-versions / minimal-versions	37s
set-msrv / set-msrv	3s
test (1.71.0)	26s
build (1.71.0, thumbv7em-none-eabi)	24s
build (1.71.0, wasm32-unknown-unknown)	27s
build (stable, thumbv7em-none-eabi)	26s
test (stable)	29s
build (stable, wasm32-unknown-unknown)	17s
	3m 9s

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