Define ordering for MetadataStoreTest

By: md_5 <git@md-5.net>

paper-api/src/test/java/org/bukkit/metadata/MetadataStoreTest.java

@@ -5,8 +5,11 @@ import java.util.List;
 import java.util.concurrent.Callable;
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.TestPlugin;
+import org.junit.jupiter.api.MethodOrderer;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
 
+@TestMethodOrder(MethodOrderer.MethodName.class)
 public class MetadataStoreTest {
     private Plugin pluginX = new TestPlugin("x");
     private Plugin pluginY = new TestPlugin("y");