Bump `digest` dependency to v0.11.0-pre.7 #922

Job	Run time
minimal-versions / minimal-versions	1m 5s
set-msrv / set-msrv	3s
test (1.71.0)	54s
build (1.71.0, thumbv7em-none-eabi)	25s
test (stable)	41s
build (1.71.0, wasm32-unknown-unknown)	26s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	35s
	4m 33s

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