Bump com.puppycrawl.tools:checkstyle from 10.21.3 to 10.21.4 (#791)

Author: dependabot[bot]

pom.xml

@@ -121,7 +121,7 @@
     <maven-surefire-plugin.version>3.5.2</maven-surefire-plugin.version>
 
     <!-- Plugin dependencies -->
-    <checkstyle.version>10.21.3</checkstyle.version>
+    <checkstyle.version>10.21.4</checkstyle.version>
     <maven-surefire-junit5-tree-reporter.version>1.4.0</maven-surefire-junit5-tree-reporter.version>
 
     <!-- Log verbosity -->