chore(deps): bump rack from 3.2.5 to 3.2.6 (#13987)

Bumps [rack](https://github.com/rack/rack) from 3.2.5 to 3.2.6.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/rack/rack/releases">rack's
releases</a>.</em></p>
<blockquote>
<h2>v3.2.6</h2>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/rack/rack/compare/v3.2.5...v3.2.6">https://github.com/rack/rack/compare/v3.2.5...v3.2.6</a></p>
</blockquote>
</details>
<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>[3.2.6] - 2026-04-01</h2>
<h3>Security</h3>
<ul>
<li><a
href="https://github.com/advisories/GHSA-7mqq-6cf9-v2qp">CVE-2026-34763</a>
Root directory disclosure via unescaped regex interpolation in
<code>Rack::Directory</code>.</li>
<li><a
href="https://github.com/advisories/GHSA-v569-hp3g-36wr">CVE-2026-34230</a>
Avoid O(n^2) algorithm in <code>Rack::Utils.select_best_encoding</code>
which could lead to denial of service.</li>
<li><a
href="https://github.com/advisories/GHSA-qfgr-crr9-7r49">CVE-2026-32762</a>
Forwarded header semicolon injection enables Host and Scheme
spoofing.</li>
<li><a
href="https://github.com/advisories/GHSA-vgpv-f759-9wx3">CVE-2026-26961</a>
Raise error for multipart requests with multiple boundary
parameters.</li>
<li><a
href="https://github.com/advisories/GHSA-q4qf-9j86-f5mh">CVE-2026-34786</a>
<code>Rack::Static</code> <code>header_rules</code> bypass via
URL-encoded path mismatch.</li>
<li><a
href="https://github.com/advisories/GHSA-q2ww-5357-x388">CVE-2026-34831</a>
<code>Content-Length</code> mismatch in <code>Rack::Files</code> error
responses.</li>
<li><a
href="https://github.com/advisories/GHSA-x8cg-fq8g-mxfx">CVE-2026-34826</a>
Multipart byte range processing allows denial of service via excessive
overlapping ranges.</li>
<li><a
href="https://github.com/advisories/GHSA-g2pf-xv49-m2h5">CVE-2026-34835</a>
<code>Rack::Request</code> accepts invalid Host characters, enabling
host allowlist bypass.</li>
<li><a
href="https://github.com/advisories/GHSA-qv7j-4883-hwh7">CVE-2026-34830</a>
<code>Rack::Sendfile</code> header-based <code>X-Accel-Mapping</code>
regex injection enables unauthorized <code>X-Accel-Redirect</code>.</li>
<li><a
href="https://github.com/advisories/GHSA-h2jq-g4cq-5ppq">CVE-2026-34785</a>
<code>Rack::Static</code> prefix matching can expose unintended files
under the static root.</li>
<li><a
href="https://github.com/advisories/GHSA-8vqr-qjwx-82mw">CVE-2026-34829</a>
Multipart parsing without <code>Content-Length</code> header allows
unbounded chunked file uploads.</li>
<li><a
href="https://github.com/advisories/GHSA-v6x5-cg8r-vv6x">CVE-2026-34827</a>
Multipart header parsing allows denial of service via escape-heavy
quoted parameters.</li>
<li><a
href="https://github.com/advisories/GHSA-rx22-g9mx-qrhv">CVE-2026-26962</a>
Improper unfolding of folded multipart headers preserves CRLF in parsed
parameter values.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="e1f22fdbe9"><code>e1f22fd</code></a>
Bump patch version.</li>
<li><a
href="31989fd7bb"><code>31989fd</code></a>
Fix typo in test.</li>
<li><a
href="d268165e39"><code>d268165</code></a>
Fix test expectation.</li>
<li><a
href="8f425de0ee"><code>8f425de</code></a>
Add Ruby v4.0 to the test matrix.</li>
<li><a
href="bf830426ce"><code>bf83042</code></a>
Drop EOL Rubies from external tests.</li>
<li><a
href="d50c4d3dab"><code>d50c4d3</code></a>
Implement OBS unfolding for multipart requests per RFC 5322 2.2.3</li>
<li><a
href="bfb69142db"><code>bfb6914</code></a>
Limit the number of quoted escapes during multipart parsing</li>
<li><a
href="b3e5945c64"><code>b3e5945</code></a>
Add Content-Length size check in Rack::Multipart::Parser</li>
<li><a
href="7a8f326966"><code>7a8f326</code></a>
Fix root prefix bug in Rack::Static</li>
<li><a
href="a57bc14024"><code>a57bc14</code></a>
Only do a simple substitution on the x-accel-mapping paths</li>
<li>Additional commits viewable in <a
href="https://github.com/rack/rack/compare/v3.2.5...v3.2.6">compare
view</a></li>
</ul>
</details>
<br />

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Sony Mathew <sony@chatwoot.com>

Gemfile.lock

@@ -684,7 +684,7 @@ GEM
       activesupport (>= 3.0.0)
     raabro (1.4.0)
     racc (1.8.1)
-    rack (3.2.5)
+    rack (3.2.6)
     rack-attack (6.7.0)
       rack (>= 1.0, < 4)
     rack-contrib (2.5.0)