Replace deprecated Mockito matcher import

Author: 8Keep

jme3-core/src/test/java/com/jme3/material/plugins/J3MLoaderTest.java

@@ -21,8 +21,8 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.Mockito.when;
 import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
 
 /**
  * @author Daniel Johansson