Bump puma from 5.6.8 to 5.6.9 in /images/benchmarks/ruby in the bundler group across 1 directory

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Bumps the bundler group with 1 update in the /images/benchmarks/ruby directory: [puma](https://github.com/puma/puma).

Updates `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 />

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=puma&package-manager=bundler&previous-version=5.6.8&new-version=5.6.9)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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[//]: # (dependabot-automerge-start)
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</details>

FUTURE_COPYBARA_INTEGRATE_REVIEW=#10935 from google:dependabot/bundler/images/benchmarks/ruby/bundler-4d937c09b0 60c90a1
PiperOrigin-RevId: 677063661

Author: dependabot[bot]

images/benchmarks/ruby/Gemfile.lock

@@ -3,8 +3,8 @@ GEM
   specs:
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.7.0)
-    puma (5.6.8)
+    nio4r (2.7.3)
+    puma (5.6.9)
       nio4r (~> 2.0)
     rack (2.2.8)
     rack-protection (2.2.3)