[Java] Remove unused dependency on sevntu checks.

Author: mjpt777

build.gradle

@@ -119,7 +119,6 @@ subprojects {
 
     dependencies {
         checkstyle 'com.puppycrawl.tools:checkstyle:8.2'
-        checkstyle 'com.github.sevntu-checkstyle:sevntu-checks:1.24.2'
 
         testCompile 'org.hamcrest:hamcrest-all:1.3'
         testCompile 'junit:junit:4.12'