Upgrade Checkstyle 10.1 -> 10.2 (#80)

See:
- https://checkstyle.sourceforge.io/releasenotes.html
- https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-10.2
- checkstyle/checkstyle@checkstyle-10.1...checkstyle-10.2

pom.xml

@@ -702,7 +702,7 @@
                         <dependency>
                             <groupId>com.puppycrawl.tools</groupId>
                             <artifactId>checkstyle</artifactId>
-                            <version>10.1</version>
+                            <version>10.2</version>
                         </dependency>
                     </dependencies>
                     <executions>