Fix Sonar Findings - add @Override (#2712)

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-repository/hawkbit-repository-jpa/src/main/java/org/eclipse/hawkbit/repository/jpa/JpaRepositoryConfiguration.java

@@ -550,6 +550,7 @@ public class JpaRepositoryConfiguration {
         return new NodeTransformer.Abstract() {
 
             // just extension points for subclasses
+            @Override
             protected <T extends Enum<T> & QueryField> Object transformValueElement(
                     final Object value, final Comparison comparison, final Class<T> queryFieldType) {
                 return queryFieldType == (Class<?>) ActionFields.class && "active".equalsIgnoreCase(comparison.getKey())