Bump `digest` to v0.11.0-pre.9 #655

Job	Run time
minimal-versions / minimal-versions	1m 4s
set-msrv / set-msrv	2s
test (1.71.0)	59s
build (1.71.0, thumbv7em-none-eabi)	25s
test (stable)	1m 5s
build (1.71.0, wasm32-unknown-unknown)	29s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	18s
	4m 46s

Provide feedback