chacha20 v0.10.0-rc.8 (#507) #841

Job	Run time
test (1.85.0)	21s
test (stable)	22s
build (stable, wasm32-unknown-unknown)	15s
build (stable, thumbv7em-none-eabi)	31s
build (1.85.0, wasm32-unknown-unknown)	18s
build (1.85.0, thumbv7em-none-eabi)	19s
minimal-versions	0s
	2m 6s

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