Bump com.puppycrawl.tools:checkstyle from 10.20.2 to 10.21.0 (#768)

Bumps
[com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle)
from 10.20.2 to 10.21.0.
<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-10.21.0</h2>
<p>Checkstyle 10.21.0 - <a
href="https://checkstyle.org/releasenotes.html#Release_10.21.0">https://checkstyle.org/releasenotes.html#Release_10.21.0</a></p>
<p>New:</p>
<p><a
href="https://redirect.github.com/checkstyle/checkstyle/issues/15985">#15985</a>
- Expand Default Value of <code>constantWaiverParentToken</code> in
MagicNumberCheck with All Operators</p>
<!-- raw HTML omitted -->
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/b505e4c041193252940d9068ba81dd3a8d2db228"><code>b505e4c</code></a>
[maven-release-plugin] prepare release checkstyle-10.21.0</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/01047b2a94a4bd1135bd37a2a49c7a547d9f9299"><code>01047b2</code></a>
doc: release notes for 10.21.0</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/8d265b3274d619b5ba3ad301ba4a31db98f4c00e"><code>8d265b3</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/13345">#13345</a>:
Enable examples tests for InterfaceMemberImpliedModifierCheck</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/9398e5ee56afd43a0c41e0adb117bf4d053a8cd4"><code>9398e5e</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/15955">#15955</a>:
improve output of run-checkstyle.yml</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/31dbc43ba0e8baf15872c0c62fc379197fb1d419"><code>31dbc43</code></a>
dependency: Update google-java-format.yml to 1.25.2</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/5e136f3d50ac985b40a4d46a554626af985129b2"><code>5e136f3</code></a>
minor: more output to run-checkstyle.yml to improve CLI experience</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/ff79d0261be48ea29482c0f65c6c7efd8a0b4c5f"><code>ff79d02</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/15955">#15955</a>:
run-checkstyle.yml use filename for download</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/975bb70d34346d0b82fd62437771bd72f936da9f"><code>975bb70</code></a>
minor: Update run-checkstyle.yml to print debug output</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/dea0f4633c614576683332f376e75399cec83e10"><code>dea0f46</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/15955">#15955</a>:
Update run-checkstyle.yml to remove extra }</li>
<li><a
href="https://github.com/checkstyle/checkstyle/commit/5b01a7f5b69d461ced4f96823bd45c4bfb202203"><code>5b01a7f</code></a>
Issue <a
href="https://redirect.github.com/checkstyle/checkstyle/issues/15955">#15955</a>:
Update run-checkstyle.yml to define latest version of checkstyle</li>
<li>Additional commits viewable in <a
href="https://github.com/checkstyle/checkstyle/compare/checkstyle-10.20.2...checkstyle-10.21.0">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>10.20.2</checkstyle.version>
+    <checkstyle.version>10.21.0</checkstyle.version>
     <maven-surefire-junit5-tree-reporter.version>1.4.0</maven-surefire-junit5-tree-reporter.version>
 
     <!-- Log verbosity -->