Bump puma from 5.6.8 to 5.6.9 (#227)

Bumps [puma](https://github.com/puma/puma) from 5.6.8 to 5.6.9.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/puma/puma/blob/master/History.md">puma's
changelog</a>.</em></p>
<blockquote>
<h2>5.6.9 / 2024-09-19</h2>
<ul>
<li>Security
<ul>
<li>Discards any headers using underscores if the non-underscore version
also exists. Without this, an attacker could overwrite values set by
intermediate proxies (e.g. X-Forwarded-For). (<a
href="https://github.com/puma/puma/security/advisories/GHSA-9hf4-67fc-4vf4">CVE-2024-45614</a>/GHSA-9hf4-67fc-4vf4)</li>
</ul>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/puma/puma/commit/f196b23be24712fb8fb16051cc124798cc84f70e"><code>f196b23</code></a>
Merge commit from fork</li>
<li><a
href="https://github.com/puma/puma/commit/24eec19bace045a4cbd43362e17964de90044e32"><code>24eec19</code></a>
5.6.9</li>
<li><a
href="https://github.com/puma/puma/commit/3c8e8b036d36158a324ec34cfb29905cc578478b"><code>3c8e8b0</code></a>
5.6.9 release note [ci skip]</li>
<li>See full diff in <a
href="https://github.com/puma/puma/compare/v5.6.8...v5.6.9">compare
view</a></li>
</ul>
</details>
<br />


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Gemfile.lock

@@ -266,7 +266,7 @@ GEM
       timeout
     net-smtp (0.3.3)
       net-protocol
-    nio4r (2.7.0)
+    nio4r (2.7.3)
     nokogiri (1.16.5)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
@@ -307,7 +307,7 @@ GEM
       slop (~> 3.0)
     psych (3.3.4)
     public_suffix (5.0.1)
-    puma (5.6.8)
+    puma (5.6.9)
       nio4r (~> 2.0)
     pusher-client (0.6.2)
       json