fix: use random port on each startApp to avoid port binding conflict in DbLiteTest

Author: vividcoder

plugins/src/test/java/org/tron/plugins/DbLiteTest.java

@@ -44,6 +44,7 @@ public class DbLiteTest {
    * init logic.
    */
   public void startApp() {
+    Args.getInstance().setRpcPort(PublicMethod.chooseRandomPort());
     context = new TronApplicationContext(DefaultConfig.class);
     appTest = ApplicationFactory.create(context);
     appTest.startup();