Bump `digest` to v0.11.0-pre.9 #1028

Job	Run time
cross (1.71.0, aarch64-unknown-linux-gnu, default)	41s
cross (1.71.0, powerpc-unknown-linux-gnu, default)	39s
cross (stable, aarch64-unknown-linux-gnu, default)	38s
cross (stable, powerpc-unknown-linux-gnu, default)	52s
minimal-versions / minimal-versions	57s
set-msrv / set-msrv	3s
test (1.71.0)	1m 13s
build (1.71.0, thumbv7em-none-eabi)	24s
test (stable)	51s
build (1.71.0, wasm32-unknown-unknown)	25s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	26s
	7m 28s

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