Bump `digest` to v0.11.0-pre.3; MSRV 1.71 #56

Job	Run time
test (1.71.0)	20s
build (1.71.0, thumbv7em-none-eabi)	16s
test (stable)	21s
build (1.71.0, wasm32-unknown-unknown)	15s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	16s
	1m 43s

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