k12

Migrate to `digest::newtype!` #1201

Job	Run time
set-msrv / set-msrv	4s
minimal-versions / minimal-versions	23s
test (1.85.0)	24s
test (stable)	16s
build (1.85.0, thumbv7em-none-eabi)	29s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	25s
build (1.85.0, wasm32-unknown-unknown)	22s
	2m 47s

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