Bump com.puppycrawl.tools:checkstyle from 10.19.0 to 10.20.2 (#931)

Author: dependabot[bot]

pom.xml

@@ -188,7 +188,7 @@
             <dependency>
               <groupId>com.puppycrawl.tools</groupId>
               <artifactId>checkstyle</artifactId>
-              <version>10.19.0</version>
+              <version>10.20.2</version>
             </dependency>
           </dependencies>
         </plugin>