Test changes

- configure mockito agent to address changes in newer java versions see https://openjdk.org/jeps/451

Co-authored-by: yannnicklamprecht <yannicklamprecht@live.de>

paper-server/src/test/java/org/bukkit/registry/RegistryClassTest.java

@@ -57,6 +57,7 @@ import org.objectweb.asm.Type;
  * Note: This test class assumes that feature flags only enable more features and do not disable vanilla ones.
  */
 @AllFeatures
+@org.junit.jupiter.api.Disabled // Paper - disabled for now as it constructs a second root registry, which is not supported on paper
 public class RegistryClassTest {
 
     private static final Map<Class<? extends Keyed>, Data> INIT_DATA = new HashMap<>();