Bump rack-session from 2.1.0 to 2.1.1 (#29)

Bumps [rack-session](https://github.com/rack/rack-session) from 2.1.0 to
2.1.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/rack/rack-session/releases">rack-session's
releases</a>.</em></p>
<blockquote>
<h2>v2.1.1</h2>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/rack/rack-session/compare/v2.1.0...v2.1.1">https://github.com/rack/rack-session/compare/v2.1.0...v2.1.1</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rack/rack-session/blob/main/releases.md">rack-session's
changelog</a>.</em></p>
<blockquote>
<h2>v2.1.1</h2>
<ul>
<li>Prevent <code>Rack::Session::Pool</code> from recreating deleted
sessions <a
href="https://github.com/rack/rack-session/security/advisories/GHSA-9j94-67jr-4cqj">CVE-2025-46336</a>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rack/rack-session/commit/96663ece1596a3462704c30f98b85cd7e0337d6e"><code>96663ec</code></a>
Bump patch version.</li>
<li><a
href="https://github.com/rack/rack-session/commit/c58ad7952cc7d0649f0ea9c78d55049739c49e5a"><code>c58ad79</code></a>
Don't allow session to be recreated accidentally.</li>
<li>See full diff in <a
href="https://github.com/rack/rack-session/compare/v2.1.0...v2.1.1">compare
view</a></li>
</ul>
</details>
<br />


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Gemfile.lock

@@ -48,7 +48,7 @@ GEM
       rake
       thor (>= 0.14.0)
     ast (2.4.2)
-    base64 (0.2.0)
+    base64 (0.3.0)
     benchmark (0.4.0)
     betterlint (1.16.0)
       rubocop (~> 1.62.0)
@@ -104,8 +104,8 @@ GEM
       date
       stringio
     racc (1.8.1)
-    rack (3.1.8)
-    rack-session (2.1.0)
+    rack (3.2.0)
+    rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.2.0)