signature: bump `digest` to v0.11.0-pre.3; MSRV 1.71 #2237

Job	Run time
doc	32s
derive (1.71.0)	18s
build (1.71.0, thumbv7em-none-eabi)	19s
derive (stable)	15s
build (1.71.0, wasm32-unknown-unknown)	18s
test (1.71.0)	27s
build (stable, thumbv7em-none-eabi)	21s
test (stable)	19s
build (stable, wasm32-unknown-unknown)	17s
minimal-versions / minimal-versions	30s
	3m 36s

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