aead

Remove unused `hazmat` feature (#1599) #2382

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 37s
test (1.65.0)	1m 37s
build (1.65.0, wasm32-unknown-unknown)	1m 37s
test (stable)	19s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	14s
	5m 43s

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