Bump zerocopy from 0.7.14 to 0.7.32 in /backend (#1057)

Bumps [zerocopy](https://github.com/google/zerocopy) from 0.7.14 to
0.7.32.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/google/zerocopy/releases">zerocopy's
releases</a>.</em></p>
<blockquote>
<h2>v0.7.32</h2>
<h2>What's Changed</h2>
<ul>
<li>[derive] Exclude large test files when publishing by <a
href="https://github.com/joshlf"><code>@​joshlf</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/744">google/zerocopy#744</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/google/zerocopy/compare/v0.7.31...v0.7.32">https://github.com/google/zerocopy/compare/v0.7.31...v0.7.32</a></p>
<h2>v0.7.31</h2>
<p>This release fixes the soundness issue described in <a
href="https://redirect.github.com/google/zerocopy/issues/716">#716</a>.
The affected versions will soon be yanked.</p>
<p>This release is also described in security advisories <a
href="https://rustsec.org/advisories/RUSTSEC-2023-0074.html">RUSTSEC-2023-0074</a>
and <a
href="https://github.com/google/zerocopy/security/advisories/GHSA-3mv5-343c-w2qg">GHSA-3mv5-343c-w2qg</a>.</p>
<h2>What's Changed</h2>
<ul>
<li>Fix soundness hole in Ref::into_ref and into_mut by <a
href="https://github.com/joshlf"><code>@​joshlf</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/721">google/zerocopy#721</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/google/zerocopy/compare/v0.7.30...v0.7.31">https://github.com/google/zerocopy/compare/v0.7.30...v0.7.31</a></p>
<h2>v0.7.30</h2>
<h2>What's Changed</h2>
<ul>
<li>[policies] Document yanking policy by <a
href="https://github.com/joshlf"><code>@​joshlf</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/677">google/zerocopy#677</a></li>
<li>[ci] Roll pinned nightly toolchain by <a
href="https://github.com/google-pr-creation-bot"><code>@​google-pr-creation-bot</code></a>
in <a
href="https://redirect.github.com/google/zerocopy/pull/680">google/zerocopy#680</a></li>
<li>[readme] Link to GitHub Releases (<a
href="https://redirect.github.com/google/zerocopy/issues/692">#692</a>)
by <a href="https://github.com/joshlf"><code>@​joshlf</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/693">google/zerocopy#693</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/google/zerocopy/compare/v0.7.29...v0.7.30">https://github.com/google/zerocopy/compare/v0.7.29...v0.7.30</a></p>
<h2>v0.7.29</h2>
<h2>What's Changed</h2>
<ul>
<li>[ci] Roll pinned nightly toolchain by <a
href="https://github.com/google-pr-creation-bot"><code>@​google-pr-creation-bot</code></a>
in <a
href="https://redirect.github.com/google/zerocopy/pull/664">google/zerocopy#664</a></li>
<li>[ci] Roll pinned nightly toolchain by <a
href="https://github.com/google-pr-creation-bot"><code>@​google-pr-creation-bot</code></a>
in <a
href="https://redirect.github.com/google/zerocopy/pull/668">google/zerocopy#668</a></li>
<li>[ci] Roll pinned nightly toolchain by <a
href="https://github.com/google-pr-creation-bot"><code>@​google-pr-creation-bot</code></a>
in <a
href="https://redirect.github.com/google/zerocopy/pull/669">google/zerocopy#669</a></li>
<li>[ci] Roll pinned nightly toolchain by <a
href="https://github.com/google-pr-creation-bot"><code>@​google-pr-creation-bot</code></a>
in <a
href="https://redirect.github.com/google/zerocopy/pull/670">google/zerocopy#670</a></li>
<li>Implement <code>TryFromBytes</code> for <code>[T]</code> by <a
href="https://github.com/jswrenn"><code>@​jswrenn</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/666">google/zerocopy#666</a></li>
<li>[ci] Roll pinned nightly toolchain by <a
href="https://github.com/google-pr-creation-bot"><code>@​google-pr-creation-bot</code></a>
in <a
href="https://redirect.github.com/google/zerocopy/pull/673">google/zerocopy#673</a></li>
<li>[derive] Fix AsBytes for <code>#[repr(C, packed(N))]</code> by <a
href="https://github.com/maurer"><code>@​maurer</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/672">google/zerocopy#672</a></li>
<li>Release 0.7.29 by <a
href="https://github.com/joshlf"><code>@​joshlf</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/676">google/zerocopy#676</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/google/zerocopy/compare/v0.7.28...v0.7.29">https://github.com/google/zerocopy/compare/v0.7.28...v0.7.29</a></p>
<h2>v0.7.28</h2>
<h2>What's Changed</h2>
<ul>
<li>Improve <code>transmute*!</code> documentation by <a
href="https://github.com/jswrenn"><code>@​jswrenn</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/661">google/zerocopy#661</a></li>
<li>Improve <code>AsBytes</code> documentation by <a
href="https://github.com/jswrenn"><code>@​jswrenn</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/660">google/zerocopy#660</a></li>
<li>[docs] Fix typo in include_value! doc comment by <a
href="https://github.com/joshlf"><code>@​joshlf</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/662">google/zerocopy#662</a></li>
<li>Release 0.7.28 by <a
href="https://github.com/joshlf"><code>@​joshlf</code></a> in <a
href="https://redirect.github.com/google/zerocopy/pull/663">google/zerocopy#663</a></li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/google/zerocopy/blob/main/CHANGELOG.md">zerocopy's
changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<h2>Releases</h2>
<p>We track releases and release notes using <a
href="https://github.com/google/zerocopy/releases">GitHub
Releases</a>.</p>
<h2>Yanks and Regressions</h2>
<h3>0.2.2 through 0.2.8, 0.3.0 through 0.3.1, 0.4.0, 0.5.0, 0.6.0
through 0.6.5, 0.7.0 through 0.7.30</h3>
<p><em>Security advisories for this bug have been published as
<a
href="https://rustsec.org/advisories/RUSTSEC-2023-0074.html">RUSTSEC-2023-0074</a>
and <a
href="https://github.com/google/zerocopy/security/advisories/GHSA-3mv5-343c-w2qg">GHSA-3mv5-343c-w2qg</a>.</em></p>
<p>In these versions, the <code>Ref</code> methods
<code>into_ref</code>, <code>into_mut</code>, <code>into_slice</code>,
and
<code>into_mut_slice</code> were permitted in combination with the
standard library
<code>cell::Ref</code> and <code>cell::RefMut</code> types for
<code>Ref&lt;B, T&gt;</code>'s <code>B</code> type parameter. These
combinations are unsound, and may permit safe code to exhibit undefined
behavior. Fixes have been published to each affected minor version which
do not
permit this code to compile.</p>
<p>See <a
href="https://redirect.github.com/google/zerocopy/issues/716">#716</a><a
href="https://redirect.github.com/google/zerocopy/issues/716">issue-716</a>
for more details.</p>
<h3>0.7.27, 0.7.28</h3>
<p>These versions were briefly yanked due to a non-soundness regression
reported in
<a
href="https://redirect.github.com/google/zerocopy/issues/672">#672</a><a
href="https://redirect.github.com/google/zerocopy/pull/672">pull-672</a>.
After reconsidering our yanking policy in <a
href="https://redirect.github.com/google/zerocopy/issues/679">#679</a><a
href="https://redirect.github.com/google/zerocopy/issues/679">issue-679</a>,
we un-yanked these versions.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/google/zerocopy/commit/94b7e0a44d4e0a3d9ce8f6f56f901a4cf50fe4b6"><code>94b7e0a</code></a>
[derive] Exclude large test files when publishing (<a
href="https://redirect.github.com/google/zerocopy/issues/744">#744</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/7d3a8f9ea6bcf982ecd77db39a8be410b098232e"><code>7d3a8f9</code></a>
Fix soundness hole in Ref::into_ref and into_mut (<a
href="https://redirect.github.com/google/zerocopy/issues/721">#721</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/961612f110ca313eea06ca2563c88c83b51da492"><code>961612f</code></a>
[readme] Link to GitHub Releases (<a
href="https://redirect.github.com/google/zerocopy/issues/692">#692</a>)
(<a
href="https://redirect.github.com/google/zerocopy/issues/693">#693</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/449b78c67f20639d7dbe5d7b5a49c6dd7e9d175e"><code>449b78c</code></a>
[ci] Roll pinned nightly toolchain (<a
href="https://redirect.github.com/google/zerocopy/issues/680">#680</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/8f7d88b90ebdb1c644c58100a9953bf54f438ec5"><code>8f7d88b</code></a>
[policies] Document yanking policy (<a
href="https://redirect.github.com/google/zerocopy/issues/677">#677</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/5b76223e0eddea87e0f81429e218d12de94cd954"><code>5b76223</code></a>
Release 0.7.29 (<a
href="https://redirect.github.com/google/zerocopy/issues/676">#676</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/941c83fb4cea49dfac025a749653c6c3ea3fc019"><code>941c83f</code></a>
[derive] Fix AsBytes for <code>#[repr(C, packed(N))]</code> (<a
href="https://redirect.github.com/google/zerocopy/issues/672">#672</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/d18d233cf4e49d6abe15730eadb0e73a96f26ce2"><code>d18d233</code></a>
[ci] Roll pinned nightly toolchain (<a
href="https://redirect.github.com/google/zerocopy/issues/673">#673</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/ac0c27e77557779a9d1c79542a7cff7b29c59c69"><code>ac0c27e</code></a>
implement <code>TryFromBytes</code> for <code>[T]</code> (<a
href="https://redirect.github.com/google/zerocopy/issues/666">#666</a>)</li>
<li><a
href="https://github.com/google/zerocopy/commit/122828ed8a360d9347ecd18989324020e79b81af"><code>122828e</code></a>
[ci] Roll pinned nightly toolchain (<a
href="https://redirect.github.com/google/zerocopy/issues/670">#670</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/google/zerocopy/compare/v0.7.14...v0.7.32">compare
view</a></li>
</ul>
</details>
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