fix: 鉴权脚本有效性校验完善

@@ -326,8 +326,9 @@ public class TcpTransportHandler extends ChannelInboundHandlerAdapter implements
         }
         String token = accessToken.getPassword();
     if (null == token
-        || StringUtils.isEmpty(token)
-        || Pattern.compile(".*[\\s\u0000]+.*").matcher(token).matches()) {
+            || StringUtils.isEmpty(token)
+            || token.contains("\000")
+            || Pattern.compile(".*[\\s\u0000]+.*").matcher(token).matches()) {
             onValidateFailed(ctx, MqttConnectReturnCode.CONNECTION_REFUSED_PAYLOAD_FORMAT_INVALID);
             return;
         }