rc5

aes: move `Block8` to the hazmat module (#463) #234

Job	Run time
build (1.84.0, thumbv7em-none-eabi)	14s
build (1.84.0, wasm32-unknown-unknown)	17s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	12s
minimal-versions	0s
test (1.84.0)	22s
test (stable)	12s
	1m 28s

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