Bump `digest` dependency to v0.11.0-pre.7 (#551) #919

Job	Run time
minimal-versions / minimal-versions	29s
set-msrv / set-msrv	2s
build (1.71.0, thumbv7em-none-eabi)	19s
build (1.71.0, wasm32-unknown-unknown)	25s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	12s
test (1.71.0)	33s
test (stable)	25s
	2m 47s

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