chore(deps): bump rustls from 0.23.37 to 0.23.43 in /robot-repo-automaton (#598)

Bumps [rustls](https://github.com/rustls/rustls) from 0.23.37 to
0.23.43.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rustls/rustls/commit/fcf61cdbba30913cfd5b40aefa83989c6233812d"><code>fcf61cd</code></a>
Prepare 0.23.43</li>
<li><a
href="https://github.com/rustls/rustls/commit/f0dad4c57112955eb1f4fa2f076458329b4221b3"><code>f0dad4c</code></a>
Check server's proposed suite against actual offer</li>
<li><a
href="https://github.com/rustls/rustls/commit/b480cc674c5229cbd56d0551d1fc0e32839e5fdd"><code>b480cc6</code></a>
Test for server choosing a non-QUIC TLS1.3 suite</li>
<li><a
href="https://github.com/rustls/rustls/commit/883a44d45aa3e8fd6db56b3429c3156cc28d737b"><code>883a44d</code></a>
Consider <code>Protocol</code> in
<code>ServerConfig::supports_version</code></li>
<li><a
href="https://github.com/rustls/rustls/commit/c2f1fd9c38e53f2c902a2481f4f78ae8aaa37e64"><code>c2f1fd9</code></a>
Check suitability of server version in QUIC client</li>
<li><a
href="https://github.com/rustls/rustls/commit/d98e1b9ea10138f6dddfe48f5440dc0aa95e22cc"><code>d98e1b9</code></a>
Add test for server <code>Tls13RequiredForQuic</code></li>
<li><a
href="https://github.com/rustls/rustls/commit/e63d9bf2c0c8f67932a0941890d36845329f7abe"><code>e63d9bf</code></a>
Bound ticket age calculation</li>
<li><a
href="https://github.com/rustls/rustls/commit/79cd46294ccb50f6a5faac9a67857e3201ddba2a"><code>79cd462</code></a>
Defensiveness improvement for binder suffix arithmetic</li>
<li><a
href="https://github.com/rustls/rustls/commit/4a9f025d50e6b98ebaa0ccb35c416998f51776d0"><code>4a9f025</code></a>
use checked_sub for the mac tag offset in Rfc5077Ticketer::decrypt</li>
<li><a
href="https://github.com/rustls/rustls/commit/3131e5c307591c0627cd670ec2585657661093d9"><code>3131e5c</code></a>
Accept that libcrux deps are vulnerable</li>
<li>Additional commits viewable in <a
href="https://github.com/rustls/rustls/compare/v/0.23.37...v/0.23.43">compare
view</a></li>
</ul>
</details>
<br />


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