Bump checkstyle to the latest version (#308)

Author: shs96c

MODULE.bazel

@@ -160,7 +160,7 @@ maven.install(
         "org.opentest4j:opentest4j:1.2.0",
 
         # Checkstyle deps
-        "com.puppycrawl.tools:checkstyle:10.2",
+        "com.puppycrawl.tools:checkstyle:10.20.0",
 
         # PMD deps
         "net.sourceforge.pmd:pmd-dist:6.46.0",