pkcs12: make `zeroize` dependency optional (#1564) #2054

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	57s
build (1.81.0, wasm32-unknown-unknown)	58s
test (1.81.0)	4m 36s
build (stable, thumbv7em-none-eabi)	49s
build (stable, wasm32-unknown-unknown)	49s
test (stable)	4m 30s
fuzz	2m 12s
minimal-versions	0s
	14m 51s

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