Bump `digest` to v0.11.0-pre.3; MSRV 1.71 #175

Job	Run time
minimal-versions / minimal-versions	44s
set-msrv / set-msrv	6s
test (1.56.0)	1m 31s
build (1.56.0, thumbv7em-none-eabi)	1m 28s
test (stable)	30s
build (1.56.0, wasm32-unknown-unknown)	1m 37s
build (stable, thumbv7em-none-eabi)	31s
build (stable, wasm32-unknown-unknown)	25s
	6m 52s

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