Update rubocop-md requirement from 1.2.3 to 1.2.4 (#469)

Updates the requirements on
[rubocop-md](https://github.com/rubocop/rubocop-md) to permit the latest
version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rubocop/rubocop-md/blob/master/CHANGELOG.md">rubocop-md's
changelog</a>.</em></p>
<blockquote>
<h2>1.2.4 (2024-10-16)</h2>
<ul>
<li>Fix RuboCop warnings.</li>
</ul>
<h2>1.2.3 (2024-09-12)</h2>
<ul>
<li>Do no try linting <code>.mdx</code> files by default.</li>
</ul>
<h2>1.2.2 (2023-12-01) ❄️</h2>
<ul>
<li>Fix analyzing code blocks with backticks.</li>
</ul>
<h2>1.2.1 (2023-10-20)</h2>
<ul>
<li>Fix incompatibility when loading the plugin from YAML and using
other RuboCop options.</li>
</ul>
<h2>1.2.0 (2023-01-31)</h2>
<ul>
<li>
<p>Fix parsing compound syntax hints in code snippets.</p>
</li>
<li>
<p>Drop Ruby 2.5 support.</p>
</li>
</ul>
<h2>1.1.0 (2022-10-24)</h2>
<ul>
<li>Ignore offenses in non-code source.</li>
</ul>
<h2>1.0.1 (2020-12-28)</h2>
<ul>
<li>Exclude <code>EmptyLineBetweenDefs</code> for MD files.</li>
</ul>
<h2>1.0.0 (2020-12-24)</h2>
<ul>
<li>Drop Ruby 2.4 support and require RuboCop 1.0.</li>
</ul>
<h2>0.4.1 (2020-11-05)</h2>
<ul>
<li>Relax required RuboCop version.</li>
</ul>
<h2>0.4.0 (2020-07-03)</h2>
<ul>
<li><a
href="https://redirect.github.com/rubocop-hq/rubocop-md/pull/10">#10</a>:
<strong>Drop Ruby 2.3 support</strong> ([<a
href="https://github.com/dominicsayers"><code>@​dominicsayers</code></a>][])</li>
</ul>
<h2>0.3.2 (2020-03-18)</h2>
<ul>
<li><a
href="https://redirect.github.com/rubocop-hq/rubocop-md/pull/9">#9</a>:
Add file extensions for Markdown ([<a
href="https://github.com/ybiquitous"><code>@​ybiquitous</code></a>][])</li>
</ul>
<h2>0.3.1 (2019-12-25)</h2>
<ul>
<li>Upgrade to RuboCop 0.78 ([<a
href="https://github.com/palkan"><code>@​palkan</code></a>][])</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/cea66199c2e94309c58c80ac0439df78ed7f6174"><code>cea6619</code></a>
Bump 1.2.4</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/f45bbe5b410a085b3a40f5bb27640eb97d71ba06"><code>f45bbe5</code></a>
Merge pull request <a
href="https://redirect.github.com/rubocop/rubocop-md/issues/39">#39</a>
from yahonda/fix_typo</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/a2584b7b835ab2428bccd37a81bcc94d586a8cf7"><code>a2584b7</code></a>
Merge pull request <a
href="https://redirect.github.com/rubocop/rubocop-md/issues/40">#40</a>
from koic/suppress_deprecation_warning</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/04c3a82008c95ecba0c2d80dc65fc97e38ac21ca"><code>04c3a82</code></a>
Suppress RuboCop's deprecation warning</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/8a0e8b7aa5cfd620d3203ec88a78ab50acce6f69"><code>8a0e8b7</code></a>
Fix typo by replacing <code>RoboCop</code> with
<code>RuboCop</code></li>
<li>See full diff in <a
href="https://github.com/rubocop/rubocop-md/compare/v1.2.3...v1.2.4">compare
view</a></li>
</ul>
</details>
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Gemfile

@@ -8,7 +8,7 @@ gem "mighty_test", "~> 0.3.0" unless RUBY_VERSION < "3.1"
 gem "minitest", "~> 5.11"
 gem "rake", "~> 13.0"
 gem "rubocop", "1.66.1"
-gem "rubocop-md", "1.2.3"
+gem "rubocop-md", "1.2.4"
 gem "rubocop-minitest", "0.36.0"
 gem "rubocop-packaging", "0.5.2"
 gem "rubocop-performance", "1.22.1"