Merge pull request #75 from xdev-software/renovate/checkstyleversion

Update checkstyleVersion to v10.21.0

Author: AB-xdev

build.gradle

@@ -8,7 +8,7 @@ plugins {
 }
 
 ext {
-    checkstyleVersion = '10.20.2'
+    checkstyleVersion = '10.21.0'
     pmdVersion = '7.8.0'
 }