Bump `digest` to v0.11.0-pre.3; MSRV 1.71 (#523) #860

Job	Run time
test-asm	21s
minimal-versions / minimal-versions	44s
set-msrv / set-msrv	3s
test (1.71.0)	30s
build (1.71.0, thumbv7em-none-eabi)	23s
test (stable)	19s
build (1.71.0, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	27s
build (stable, wasm32-unknown-unknown)	26s
	3m 33s

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