Bump puma from 5.6.5 to 5.6.7 in /examples/stacks/rails/blog (#1409)

Bumps [puma](https://github.com/puma/puma) from 5.6.5 to 5.6.7.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/puma/puma/releases">puma's
releases</a>.</em></p>
<blockquote>
<h2>5.6.7</h2>
<p>Security
Address HTTP request smuggling vulnerabilities with zero-length Content
Length header and trailer fields (<a
href="https://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8">GHSA-68xg-gqqm-vgj8</a>)</p>
</blockquote>
</details>
<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>5.6.7 / 2023-08-18</h2>
<ul>
<li>Security
<ul>
<li>Address HTTP request smuggling vulnerabilities with zero-length
Content Length header and trailer fields (<a
href="https://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8">GHSA-68xg-gqqm-vgj8</a>)</li>
</ul>
</li>
</ul>
<h2>5.6.6 / 2023-06-21</h2>
<ul>
<li>Bugfix
<ul>
<li>Prevent loading with rack 3 (<a
href="https://redirect.github.com/puma/puma/issues/3166">#3166</a>)</li>
</ul>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/puma/puma/commit/78393bf2c58bf293860fa9cdc73938ac58c18afb"><code>78393bf</code></a>
5.6.7</li>
<li><a
href="https://github.com/puma/puma/commit/7405a219801dcebc0ad6e0aa108d4319ca23f662"><code>7405a21</code></a>
Merge pull request from GHSA-68xg-gqqm-vgj8</li>
<li><a
href="https://github.com/puma/puma/commit/d33424b560eab163d8869d90341d57795d63bb99"><code>d33424b</code></a>
5.6.7 release note [ci skip]</li>
<li><a
href="https://github.com/puma/puma/commit/f8c7b235f971ed6b290cc4733fe7bce840037ede"><code>f8c7b23</code></a>
5.6.6</li>
<li><a
href="https://github.com/puma/puma/commit/08af1b5d797ab49f9d594a71f0c1f88bbff7915a"><code>08af1b5</code></a>
5.6.6 release note</li>
<li><a
href="https://github.com/puma/puma/commit/6dac5d930d04e617b0fd8cd4e5947cd2586b7502"><code>6dac5d9</code></a>
Prevent loading with rack 3 (<a
href="https://redirect.github.com/puma/puma/issues/3166">#3166</a>)</li>
<li><a
href="https://github.com/puma/puma/commit/08925580e41734b4a8f063b9b401085476d5e9b9"><code>0892558</code></a>
Fix and update 5-6-stable CI, two backports (<a
href="https://redirect.github.com/puma/puma/issues/3167">#3167</a>)</li>
<li><a
href="https://github.com/puma/puma/commit/3a6ea4f4327dfe2e6e1cd16f2e093b3c43ad9951"><code>3a6ea4f</code></a>
Release note fix for 5.6.5</li>
<li>See full diff in <a
href="https://github.com/puma/puma/compare/v5.6.5...v5.6.7">compare
view</a></li>
</ul>
</details>
<br />


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examples/stacks/rails/blog/Gemfile

@@ -13,7 +13,7 @@ gem "sprockets-rails"
 gem "sqlite3", "~> 1.4"
 
 # Use the Puma web server [https://github.com/puma/puma]
-gem "puma", "~> 5.0"
+gem "puma", "~> 5.6"
 
 # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
 gem "importmap-rails"

examples/stacks/rails/blog/Gemfile.lock

@@ -132,7 +132,7 @@ GEM
     nokogiri (1.14.3-x86_64-linux)
       racc (~> 1.4)
     public_suffix (5.0.1)
-    puma (5.6.5)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.6.4)
@@ -225,7 +225,7 @@ DEPENDENCIES
   debug
   importmap-rails
   jbuilder
-  puma (~> 5.0)
+  puma (~> 5.6)
   rails (~> 7.0.4)
   selenium-webdriver
   sprockets-rails