Remove unused `hazmat` feature (#1599) #2770

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	39s
minimal-versions	0s
build (1.73.0, wasm32-unknown-unknown)	39s
build (stable, thumbv7em-none-eabi)	37s
build (stable, wasm32-unknown-unknown)	34s
test (1.73.0)	32s
test (stable)	26s
test (nightly)	31s
	3m 58s

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