Remove unused `hazmat` feature (#1599) #2113

Job	Run time
minimal-versions	0s
no_std (1.75.0, thumbv7em-none-eabi)	12s
test (1.75.0)	18s
test (stable)	10s
no_std (1.75.0, wasm32-unknown-unknown)	13s
no_std (stable, thumbv7em-none-eabi)	10s
no_std (stable, wasm32-unknown-unknown)	6s
	1m 9s

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