[CI][Test] Fix engine-k8s-it failed (apache#7101)

* update

* update

Author: Hisoka-X

seatunnel-e2e/seatunnel-engine-e2e/connector-seatunnel-e2e-base/src/test/java/org/apache/seatunnel/engine/e2e/ClusterFaultToleranceIT.java

@@ -839,6 +839,7 @@ public void testStreamJobRestoreInAllNodeDown() throws Exception {
             // shutdown all node
             node1.shutdown();
             node2.shutdown();
+            engineClient.close();
 
             log.warn(
                     "==========================================All node is done========================================");