fix : Increases the wait time for test cases when the server side is down

hippo4j-rpc/src/test/java/cn/hippo4j/rpc/support/NettyServerSupportTest.java

@@ -35,6 +35,7 @@ public class NettyServerSupportTest {
         }
         Assert.assertTrue(support.isActive());
         support.close();
+        ThreadUtil.sleep(1000L);
         Assert.assertFalse(support.isActive());
     }