Update dependency com.puppycrawl.tools:checkstyle to v10.12.6

Author: renovate[bot]

pom.xml

@@ -133,7 +133,7 @@
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>
                         <artifactId>checkstyle</artifactId>
-                        <version>10.12.5</version>
+                        <version>10.12.6</version>
                     </dependency>
                 </dependencies>
                 <executions>