[Hotfix][Connector][Jdbc] Fix the problem of JdbcOutputFormat databas…

…e connection leak

seatunnel-connectors-v2/connector-jdbc/src/main/java/org/apache/seatunnel/connectors/seatunnel/jdbc/internal/JdbcOutputFormat.java

@@ -219,7 +219,7 @@ public synchronized void close() {
                     flush();
                 } catch (Exception e) {
                     LOG.warn("Writing records to JDBC failed.", e);
-                    throw new JdbcConnectorException(
+                    flushException = new JdbcConnectorException(
                             CommonErrorCode.FLUSH_DATA_FAILED,
                             "Writing records to JDBC failed.",
                             e);