chore(deps-dev): bump activesupport from 8.1.1 to 8.1.2.1 in /docs in the bundler group across 1 directory (#5107)

Bumps the bundler group with 1 update in the /docs directory:
[activesupport](https://github.com/rails/rails).

Updates `activesupport` from 8.1.1 to 8.1.2.1
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/rails/rails/releases">activesupport's
releases</a>.</em></p>
<blockquote>
<h2>8.1.2.1</h2>
<h2>Active Support</h2>
<ul>
<li>
<p>Reject scientific notation in NumberConverter</p>
<p>[CVE-2026-33176]</p>
<p><em>Jean Boussier</em></p>
</li>
<li>
<p>Fix <code>SafeBuffer#%</code> to preserve unsafe status</p>
<p>[CVE-2026-33170]</p>
<p><em>Jean Boussier</em></p>
</li>
<li>
<p>Improve performance of NumberToDelimitedConverter</p>
<p>[CVE-2026-33169]</p>
<p><em>Jean Boussier</em></p>
</li>
</ul>
<h2>Active Model</h2>
<ul>
<li>No changes.</li>
</ul>
<h2>Active Record</h2>
<ul>
<li>No changes.</li>
</ul>
<h2>Action View</h2>
<ul>
<li>
<p>Skip blank attribute names in tag helpers to avoid generating invalid
HTML.</p>
<p>[CVE-2026-33168]</p>
<p><em>Mike Dalessio</em></p>
</li>
</ul>
<h2>Action Pack</h2>
<ul>
<li>
<p>Fix possible XSS in DebugExceptions middleware</p>
<p>[CVE-2026-33167]</p>
<p><em>John Hawthorn</em></p>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rails/rails/blob/v8.1.2.1/activesupport/CHANGELOG.md">activesupport's
changelog</a>.</em></p>
<blockquote>
<h2>Rails 8.1.2.1 (March 23, 2026)</h2>
<ul>
<li>
<p>Reject scientific notation in NumberConverter</p>
<p>[CVE-2026-33176]</p>
<p><em>Jean Boussier</em></p>
</li>
<li>
<p>Fix <code>SafeBuffer#%</code> to preserve unsafe status</p>
<p>[CVE-2026-33170]</p>
<p><em>Jean Boussier</em></p>
</li>
<li>
<p>Improve performance of NumberToDelimitedConverter</p>
<p>[CVE-2026-33169]</p>
<p><em>Jean Boussier</em></p>
</li>
</ul>
<h2>Rails 8.1.2 (January 08, 2026)</h2>
<ul>
<li>
<p>Make <code>delegate</code> and <code>delegate_missing_to</code> work
in BasicObject subclasses.</p>
<p><em>Rafael Mendonça França</em></p>
</li>
<li>
<p>Fix Inflectors when using a locale that fallbacks to
<code>:en</code>.</p>
<p><em>Said Kaldybaev</em></p>
</li>
<li>
<p>Fix <code>ActiveSupport::TimeWithZone#as_json</code> to consistently
return UTF-8 strings.</p>
<p>Previously the returned string would sometime be encoded in US-ASCII,
which in
some cases may be problematic.</p>
<p>Now the method consistently always return UTF-8 strings.</p>
<p><em>Jean Boussier</em></p>
</li>
<li>
<p>Fix <code>TimeWithZone#xmlschema</code> when wrapping a
<code>DateTime</code> instance in local time.</p>
<p>Previously it would return an invalid time.</p>
<p><em>Dmytro Rymar</em></p>
</li>
<li>
<p>Implement LocalCache strategy on
<code>ActiveSupport::Cache::MemoryStore</code>. The memory store
needs to respond to the same interface as other cache stores (e.g.
<code>ActiveSupport::NullStore</code>).</p>
<p><em>Mikey Gough</em></p>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rails/rails/commit/1db4b89687cc18311fc3f92623136705df24e671"><code>1db4b89</code></a>
Preparing for 8.1.2.1 release</li>
<li><a
href="https://github.com/rails/rails/commit/1c7d1cf0a1ab4142eb20ef30fe2062aad6f72e21"><code>1c7d1cf</code></a>
Update changelog</li>
<li><a
href="https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49"><code>ec1a0e2</code></a>
Improve performance of NumberToDelimitedConverter</li>
<li><a
href="https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7"><code>50d732a</code></a>
Fix <code>SafeBuffer#%</code> to preserve unsafe status</li>
<li><a
href="https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb"><code>19dbab5</code></a>
NumberConverter: reject scientific notation</li>
<li><a
href="https://github.com/rails/rails/commit/d7c8ae65b7045490965218a994c300aea8dbb079"><code>d7c8ae6</code></a>
Preparing for 8.1.2 release</li>
<li><a
href="https://github.com/rails/rails/commit/3ea2701a15ac253fc6b87b0034a87e3abcb3d3e5"><code>3ea2701</code></a>
CHANGELOG sync</li>
<li><a
href="https://github.com/rails/rails/commit/0f8014a0ff97888c747a481ea8ef61015c160fd4"><code>0f8014a</code></a>
[8-1-stable] Minitest 6 support</li>
<li><a
href="https://github.com/rails/rails/commit/991ccf35933f5df1dcf1283a1ad2f9667c864fa6"><code>991ccf3</code></a>
Merge pull request <a
href="https://redirect.github.com/rails/rails/issues/56393">#56393</a>
from rails/add-exclude-keys-to-live-controller</li>
<li><a
href="https://github.com/rails/rails/commit/c86465f65278d2a6200424d2853fc848a0e01356"><code>c86465f</code></a>
Merge pull request <a
href="https://redirect.github.com/rails/rails/issues/56353">#56353</a>
from rails/rmf-delegation-basic-object</li>
<li>Additional commits viewable in <a
href="https://github.com/rails/rails/compare/v8.1.1...v8.1.2.1">compare
view</a></li>
</ul>
</details>
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docs/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (8.1.1)
+    activesupport (8.1.2.1)
       base64
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
@@ -17,7 +17,7 @@ GEM
     addressable (2.8.8)
       public_suffix (>= 2.0.2, < 8.0)
     base64 (0.3.0)
-    bigdecimal (3.3.1)
+    bigdecimal (4.0.1)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -105,7 +105,7 @@ GEM
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.8.1)
-    i18n (1.14.7)
+    i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     jekyll (3.10.0)
       addressable (~> 2.4)
@@ -232,7 +232,9 @@ GEM
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    minitest (5.27.0)
+    minitest (6.0.2)
+      drb (~> 2.0)
+      prism (~> 1.5)
     net-http (0.9.1)
       uri (>= 0.11.1)
     nokogiri (1.19.1-x86_64-linux-gnu)
@@ -242,6 +244,7 @@ GEM
       sawyer (~> 0.9)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
+    prism (1.9.0)
     public_suffix (5.1.1)
     racc (1.8.1)
     rb-fsevent (0.11.2)