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blake2: add unkeyed hashing (#612) #1138

Job	Run time
set-msrv / set-msrv	4s
minimal-versions / minimal-versions	39s
build (1.81.0, thumbv7em-none-eabi)	22s
build (1.81.0, wasm32-unknown-unknown)	24s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	37s
build (1.81.0, loongarch64-unknown-linux-gnu)	26s
linux (x86_64-unknown-linux-gnu, 1.81.0)	35s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	36s
build (stable, thumbv7em-none-eabi)	19s
cross (stable, aarch64-unknown-linux-gnu, default)	40s
linux (x86_64-unknown-linux-gnu, stable)	40s
build (stable, wasm32-unknown-unknown)	26s
cross (stable, powerpc-unknown-linux-gnu, default)	38s
macos (1.81.0)	27s
windows (x86_64-pc-windows-gnu, 1.81.0)	58s
build (stable, loongarch64-unknown-linux-gnu)	21s
macos (stable)	21s
windows (x86_64-pc-windows-gnu, stable)	2m 43s
	11m 16s

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