pkcs12: make `zeroize` dependency optional (#1564) #1081

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	21s
minimal-versions	0s
build (1.81.0, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	34s
test (1.81.0)	25s
build (stable, wasm32-unknown-unknown)	17s
test (stable)	19s
	2m 18s

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