[Fix][Connector-V2] Fix hive client thread unsafe

Author: corgy-w

seatunnel-connectors-v2/connector-hive/src/main/java/org/apache/seatunnel/connectors/seatunnel/hive/utils/HiveMetaStoreProxy.java

@@ -64,7 +64,7 @@ public class HiveMetaStoreProxy implements Closeable, Serializable {
     private final String keytabPath;
     private final String remoteUser;
 
-    private HiveMetaStoreClient hiveClient;
+    private transient HiveMetaStoreClient hiveClient;
 
     public HiveMetaStoreProxy(ReadonlyConfig config) {
         this.metastoreUri = config.get(HiveOptions.METASTORE_URI);