Bump `digest` dependency to v0.11.0-pre.7 #918

Job	Run time
minimal-versions / minimal-versions	24s
set-msrv / set-msrv	2s
test (1.71.0)	26s
build (1.71.0, thumbv7em-none-eabi)	19s
test (stable)	34s
build (1.71.0, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	33s
	2m 57s

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