zeroize: support unsized types in Zeroizing #1057

Job	Run time
cross (aarch64-unknown-linux-gnu, 1.85.0)	47s
cross (powerpc-unknown-linux-gnu, 1.85.0)	44s
x86 (x86_64-unknown-linux-gnu, stable)	28s
cross (aarch64-unknown-linux-gnu, stable)	39s
build (stable, armv7a-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	18s
cross (powerpc-unknown-linux-gnu, stable)	44s
build (1.85.0, thumbv7em-none-eabi)	17s
build (stable, thumbv7em-none-eabi)	12s
x86 (x86_64-unknown-linux-gnu, 1.85.0)	25s
build (1.85.0, armv7a-none-eabi)	19s
build (1.85.0, wasm32-unknown-unknown)	16s
test (x86_64-apple-darwin, macos-latest, stable)	17s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	31s
test (x86_64-pc-windows-msvc, windows-latest, stable)	40s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	17s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	9s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	29s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	35s
minimal-versions / minimal-versions	58s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	36s
	9m 59s

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