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

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Details
Package	zerocopy
Version	0.7.30
URL	google/zerocopy#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
Aliases	GHSA-3mv5-343c-w2qg, GHSA-rjhf-4mh8-9xjq

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 google/zerocopy#716 for a more in-depth analysis.

The current plan is to yank the affected versions soon. See
google/zerocopy#679 for more detail.