RUSTSEC-2023-0074: Some Ref methods are unsound with some type parameters

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Details
Package	zerocopy
Version	0.7.23
URL	https://github.com/google/zerocopy/issues/716
Patched Versions	>=0.2.9, <0.3.0 OR >=0.3.2, <0.4.0 OR >=0.4.1, <0.5.0 OR >=0.5.2, <0.6.0 OR >=0.6.6, <0.7.0 OR >=0.7.31
Unaffected Versions	<0.2.2

The Ref methods into_ref, into_mut, into_slice, and into_slice_mut are unsound and may allow safe code to exhibit undefined behavior when used with Ref<B, T> where B is cell::Ref or cell::RefMut. Note that these methods remain sound when used with B types other than cell::Ref or cell::RefMut.

See https://github.com/google/zerocopy/issues/716 for a more in-depth analysis.

The current plan is to yank the affected versions soon. See https://github.com/google/zerocopy/issues/679 for more detail.