Bump `digest` dependency to v0.11.0-pre.4 #538

Job	Run time
minimal-versions / minimal-versions	43s
set-msrv / set-msrv	3s
build (1.71.0, thumbv7em-none-eabi)	20s
test (1.71.0)	33s
build (1.71.0, wasm32-unknown-unknown)	24s
test (stable)	26s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	17s
	3m 8s

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