Merge pull request #16 from neziw/renovate/checkstyle-10.x

Update dependency checkstyle to v10.20.1

build.gradle.kts

@@ -35,7 +35,7 @@ java {
 }
 
 checkstyle {
-    toolVersion = "10.20.0"
+    toolVersion = "10.20.1"
     maxWarnings = 0
 }