Bump rack from 2.2.12 to 2.2.13 in /examples/stacks/rails/blog (#2558)

Bumps [rack](https://github.com/rack/rack) from 2.2.12 to 2.2.13.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rack/rack/blob/main/CHANGELOG.md">rack's
changelog</a>.</em></p>
<blockquote>
<h2>[2.2.13] - 2025-03-11</h2>
<h3>Security</h3>
<ul>
<li><a
href="https://github.com/rack/rack/security/advisories/GHSA-7wqh-767x-r66v">CVE-2025-27610</a>
Local file inclusion in <code>Rack::Static</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rack/rack/commit/df6c47357f6c6bec2d585f45f417285d813d9b3a"><code>df6c473</code></a>
Bump patch verison.</li>
<li><a
href="https://github.com/rack/rack/commit/cceb70c72022503115b8d4d95d1037caf8aba73c"><code>cceb70c</code></a>
Update changelog.</li>
<li><a
href="https://github.com/rack/rack/commit/873d39e6d673a91fbdeb2ec75d42184d35908bb4"><code>873d39e</code></a>
Use a fully resolved file path when confirming if a file can be served
by `Ra...</li>
<li>See full diff in <a
href="https://github.com/rack/rack/compare/v2.2.12...v2.2.13">compare
view</a></li>
</ul>
</details>
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examples/stacks/rails/blog/Gemfile.lock

@@ -141,7 +141,7 @@ GEM
     puma (5.6.9)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (2.2.12)
+    rack (2.2.13)
     rack-test (2.1.0)
       rack (>= 1.3)
     rails (7.0.8.7)