Bump `digest` dependency to v0.11.0-pre.4 (#538) #889

Job	Run time
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	2s
test (1.71.0)	30s
build (1.71.0, thumbv7em-none-eabi)	26s
test (stable)	18s
build (1.71.0, wasm32-unknown-unknown)	25s
build (stable, thumbv7em-none-eabi)	1m 58s
build (stable, wasm32-unknown-unknown)	17s
	4m 32s

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