Bump rack from 2.2.6.2 to 2.2.6.4 (#9)

Bumps [rack](https://github.com/rack/rack) from 2.2.6.2 to 2.2.6.4.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rack/rack/commit/27addc7f1ae290b6b84c1c351e5b6d75a05bb40b"><code>27addc7</code></a>
bump version</li>
<li><a
href="https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff"><code>ee7919e</code></a>
Avoid ReDoS problem</li>
<li><a
href="https://github.com/rack/rack/commit/d6b5b2bab88f458fb048133604faebea952d8133"><code>d6b5b2b</code></a>
bump version</li>
<li><a
href="https://github.com/rack/rack/commit/9aac3757fe19cdb0476504c9245170115bec9668"><code>9aac375</code></a>
Limit all multipart parts, not just files</li>
<li>See full diff in <a
href="https://github.com/rack/rack/compare/v2.2.6.2...v2.2.6.4">compare
view</a></li>
</ul>
</details>
<br />


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Gemfile.lock

@@ -85,7 +85,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     racc (1.6.1)
-    rack (2.2.6.2)
+    rack (2.2.6.4)
     rack-test (2.0.2)
       rack (>= 1.3)
     rails-dom-testing (2.0.3)