Update rubocop-md requirement from 1.2.1 to 1.2.2 (#414)

Updates the requirements on
[rubocop-md](https://github.com/rubocop-hq/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>1.2.2 (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>
<ul>
<li><strong>Drop Ruby 2.2 support</strong> (<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/7c04c4492adc3c881a58584aa3e4d6d7bc15ddfe"><code>7c04c44</code></a>
Bump 1.2.2</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/e7d2bfe1333c0cee849e5d572e59376cfe44e738"><code>e7d2bfe</code></a>
fix: preserve syntax errors spanning markdown</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/f94a787bdceb5f30655853ea4251e678045e7eab"><code>f94a787</code></a>
Put comments on MD_REGEXP</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/421bf944eb029364a546ed2549cb1a427cd69924"><code>421bf94</code></a>
Rework how markdown is extracted</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/fc791fa8b6f0d8a0a27965a7f3b543ac6e0dd8ca"><code>fc791fa</code></a>
Remove SquigglyHeredoc refinement</li>
<li>See full diff in <a
href="https://github.com/rubocop-hq/rubocop-md/compare/v1.2.1...v1.2.2">compare
view</a></li>
</ul>
</details>
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Gemfile

@@ -6,7 +6,7 @@ gem "minitest", "~> 5.11"
 gem "minitest-rg"
 gem "rake", "~> 13.0"
 gem "rubocop", "1.57.2"
-gem "rubocop-md", "1.2.1"
+gem "rubocop-md", "1.2.2"
 gem "rubocop-minitest", "0.33.0"
 gem "rubocop-packaging", "0.5.2"
 gem "rubocop-performance", "1.19.1"