Update rubocop-md requirement from 1.2.0 to 1.2.1 (#411)

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>1.2.1 (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>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/e7f7abd34885d062a7b2d717ba32572b625b9eb1"><code>e7f7abd</code></a>
Bump 1.2.1</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/9677c82ccaf6c689fe7b96c3f82859bfdc22d9c9"><code>9677c82</code></a>
refactor: handling two require modes</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/b73d227920c33b979a0131e46c4210cb5b6559b9"><code>b73d227</code></a>
run Raketask :test twice with different modes</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/02902850ebf020beadf1d436f1b6947650220f2b"><code>0290285</code></a>
Fixing the problem when RuboCop::Markdown.config_store was not
filled.</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/48fe129839ee5746a05039fda4bf47bad4152471"><code>48fe129</code></a>
Fix broken README</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/e9c468d87754b67df6545b7fbb9ea894a1e24d07"><code>e9c468d</code></a>
Bump actions/checkout from 3 to 4</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/b6d99708be2b3b65db3ad87d5fa109db2c4d968a"><code>b6d9970</code></a>
style: upgrade rubocop</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/28f39d1de954ebbf6c0d69e21b7f4da565a358fa"><code>28f39d1</code></a>
readme: add projects</li>
<li><a
href="https://github.com/rubocop/rubocop-md/commit/b1ab1172baffbe758b5ed18e60f60c4c1f6c96f7"><code>b1ab117</code></a>
chore: housekeeping</li>
<li>See full diff in <a
href="https://github.com/rubocop-hq/rubocop-md/compare/v1.2.0...v1.2.1">compare
view</a></li>
</ul>
</details>
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Gemfile

@@ -7,7 +7,7 @@ gem "minitest-ci", "~> 3.4"
 gem "minitest-reporters", "~> 1.3"
 gem "rake", "~> 13.0"
 gem "rubocop", "1.56.4"
-gem "rubocop-md", "1.2.0"
+gem "rubocop-md", "1.2.1"
 gem "rubocop-minitest", "0.33.0"
 gem "rubocop-packaging", "0.5.2"
 gem "rubocop-performance", "1.19.1"