remove static modifier from inner class

Signed-off-by: Michael Hirsch <michael.hirsch@bosch-si.com>

hawkbit-repository/src/main/java/org/eclipse/hawkbit/eventbus/event/AbstractPropertyChangeEvent.java

@@ -47,7 +47,7 @@ public class AbstractPropertyChangeEvent<E extends BaseEntity> extends AbstractB
      * Carries old value and new value of a property .
      *
      */
-    public static class Values {
+    public class Values {
         private final Object oldValue;
         private final Object newValue;