Bump clap from 4.3.8 to 4.3.9 in /cmd/pinniped-proxy (#6343)

Bumps [clap](https://github.com/clap-rs/clap) from 4.3.8 to 4.3.9.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/clap-rs/clap/releases">clap's
releases</a>.</em></p>
<blockquote>
<h2>v4.3.9</h2>
<h2>[4.3.9] - 2023-06-28</h2>
<h3>Fixes</h3>
<ul>
<li><code>Command::ignore_errors</code> no longer masks
help/version</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/clap-rs/clap/blob/master/CHANGELOG.md">clap's
changelog</a>.</em></p>
<blockquote>
<h2>[4.3.9] - 2023-06-28</h2>
<h3>Fixes</h3>
<ul>
<li><code>Command::ignore_errors</code> no longer masks
help/version</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/clap-rs/clap/commit/18f0ad46765083e16aeb44c6ae070e041c280ff5"><code>18f0ad4</code></a>
chore: Release</li>
<li><a
href="https://github.com/clap-rs/clap/commit/94015b1a696221bc53605e11a0ce9506988eb4c1"><code>94015b1</code></a>
docs: Update changelog</li>
<li><a
href="https://github.com/clap-rs/clap/commit/d83cc6d3e771687f53b4766c15ad9f572c0b9d83"><code>d83cc6d</code></a>
Merge pull request <a
href="https://redirect.github.com/clap-rs/clap/issues/4988">#4988</a>
from sebastiantoh/ignore-errors</li>
<li><a
href="https://github.com/clap-rs/clap/commit/8103e9760a9e6267490b5c09439416ef575d5991"><code>8103e97</code></a>
fix(ignore_errors): Allow help and version command</li>
<li><a
href="https://github.com/clap-rs/clap/commit/d451e0a60cfed489999fbccd9334a4a680dc3583"><code>d451e0a</code></a>
test(ignore_errors): Add help &amp; version cmd tests</li>
<li>See full diff in <a
href="https://github.com/clap-rs/clap/compare/v4.3.8...v4.3.9">compare
view</a></li>
</ul>
</details>
<br />


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