Update rubocop-md requirement from 1.2.2 to 1.2.3 (#466)

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>1.2.3 (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>
<p>Change the default config to use the new cop names for (e.g.,
<code>Layout/LineLength</code>).</p>
<h2>0.3.0 (2019-05-14)</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/e0161f5dec3ead7e150e186bd284405cee15a14e"><code>e0161f5</code></a>
Bump 1.2.3</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/efe54bf81e0aebb19a69625a7a38b258c82d3815"><code>efe54bf</code></a>
style: ignore FileName for md</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/fefd6055fea6dfbf81db0982476169b8174a090f"><code>fefd605</code></a>
ci: add release.yml</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/f4c06e11e05b1a1018b9bf1cb5dc63af416009ba"><code>f4c06e1</code></a>
style: fix rubocop</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/09ebd2968c44977f481b76b68107eabec2f2cbca"><code>09ebd29</code></a>
Merge pull request <a
href="https://redirect.github.com/rubocop/rubocop-md/issues/38">#38</a>
from larouxn/remove_mdx_support</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/602adbd31b8a5a571ebec9b9d0cc3ed3bad82633"><code>602adbd</code></a>
Remove mdx support as it appears bugged</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/8ade43691b668a48a8cd68d43e32434da33d7e27"><code>8ade436</code></a>
Merge pull request <a
href="https://redirect.github.com/rubocop/rubocop-md/issues/34">#34</a>
from Earlopain/default-config-inherit</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/cf2660a283226a66552fd7af65961644e86ac0e9"><code>cf2660a</code></a>
Merge pull request <a
href="https://redirect.github.com/rubocop/rubocop-md/issues/35">#35</a>
from Earlopain/3.3-ci</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/8a0cf94a2a279cdf4ef0e202a5d87746a5c15170"><code>8a0cf94</code></a>
Add ruby 3.3 to CI</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/96f5e46f16a99423e43270bf3249788ea6e6f112"><code>96f5e46</code></a>
Fix incompatibility with RuboCop extensions that modify Include/Exclude
for cops</li>
<li>Additional commits viewable in <a
href="https://github.com/rubocop/rubocop-md/compare/v1.2.2...v1.2.3">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", "1.2.2"
+gem "rubocop-md", "1.2.3"
 gem "rubocop-minitest", "0.36.0"
 gem "rubocop-packaging", "0.5.2"
 gem "rubocop-performance", "1.21.1"