Bump com.puppycrawl.tools:checkstyle from 10.21.0 to 10.21.1 (#777)

Bumps
[com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle)
from 10.21.0 to 10.21.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/checkstyle/checkstyle/releases">com.puppycrawl.tools:checkstyle's
releases</a>.</em></p>
<blockquote>
<h2>checkstyle-10.21.1</h2>
<p>Checkstyle 10.21.1 - <a
href="https://checkstyle.org/releasenotes.html#Release_10.21.1">https://checkstyle.org/releasenotes.html#Release_10.21.1</a></p>
<p>Bug fixes:</p>
<p><a
href="https://redirect.github.com/checkstyle/checkstyle/issues/11374">#11374</a>
- UnusedLocalVariable: False Positive when inner class has same field as
variable</p>
<!-- raw HTML omitted -->
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/426bbe4453679d6f887c22ab32fa1fc36e41f955"><code>426bbe4</code></a>
[maven-release-plugin] prepare release checkstyle-10.21.1</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/01f6dc717b3667e63bf1620c01364e088375c4a0"><code>01f6dc7</code></a>
doc: release notes for 10.21.1</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/78afa196cf01f071b372392ea23601cb4719db88"><code>78afa19</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/14881">#14881</a>:
remove null from ValidateUntaggedSummary</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/60627079389a883efba692c241b4d73dabc09178"><code>6062707</code></a>
dependency: bump pmd.version from 7.8.0 to 7.9.0</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/e123c5ea5c8a87d6f2b385e0eadbed9b578e5272"><code>e123c5e</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/13345">#13345</a>:
Enable examples tests for PackageNameCheckExamplesTest</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/6f61072ef4eef25aaebfa81b9760e371b51f4bbd"><code>6f61072</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/14631">#14631</a>:
Updated code_literal to new AST format</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/453dd9a02554f321b2ad1bc5cc1faa03de929a21"><code>453dd9a</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/13345">#13345</a>:
Enable example test for SuppressWarningFilters</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/3433ab6bf19028961a42d974d9f2dd3c3f79eae0"><code>3433ab6</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/13345">#13345</a>:
Enable examples tests for MissingJavadocPackageCheck</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/ffafaf6b30ad7b2f00c94a22f031f8a19a2423a2"><code>ffafaf6</code></a>
dependency: Update maven checkstyle plugin to 3.6.0</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/6f59c099dca4506a4209dee4dd998ffe0bd5a35f"><code>6f59c09</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/14631">#14631</a>:
Updated Right_Brace to new AST format</li>
<li>Additional commits viewable in <a
href="https://github.com/checkstyle/checkstyle/compare/checkstyle-10.21.0...checkstyle-10.21.1">compare
view</a></li>
</ul>
</details>
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pom.xml

@@ -121,7 +121,7 @@
     <maven-surefire-plugin.version>3.5.2</maven-surefire-plugin.version>
 
     <!-- Plugin dependencies -->
-    <checkstyle.version>10.21.0</checkstyle.version>
+    <checkstyle.version>10.21.1</checkstyle.version>
     <maven-surefire-junit5-tree-reporter.version>1.4.0</maven-surefire-junit5-tree-reporter.version>
 
     <!-- Log verbosity -->