修复接收类型问题

Author: z564855949

weixin-java-channel/src/main/java/me/chanjar/weixin/channel/bean/order/MainProductInfo.java

@@ -31,7 +31,7 @@ public class MainProductInfo implements Serializable {
    * 商品id
    */
   @JsonProperty("product_id")
-  private Integer productId;
+  private String productId;
 
   /**
    * 主品sku_id