Bump `digest` dependency to v0.11.0-pre.7 #298

Job	Run time
minimal-versions / minimal-versions	29s
set-msrv / set-msrv	4s
test (1.71.0)	38s
build (1.71.0, thumbv7em-none-eabi)	22s
test (stable)	28s
build (1.71.0, wasm32-unknown-unknown)	30s
build (stable, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	13s
	3m 4s

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