针对 cn.hutool.core.date.DateTime 类型的属性反序列化时报错

### 问题描述
针对 cn.hutool.core.date.DateTime 类型的属性反序列化时报错

### 环境信息
*请填写以下信息：*

- OS信息： win10
- JDK信息： jdk17
- 版本信息：fastsjon2 目前最新

### 重现步骤
运行main

```java
public class DateTimeTest {

public static void main(String[] args) {
JSON.configReaderDateFormat("yyyy-MM-dd HH:mm:ss");
JSON.configWriterDateFormat("yyyy-MM-dd HH:mm:ss");

Bean bean1 = new Bean();
bean1.setDate3(new DateTime());

String jsonString = JSON.toJSONString(bean1);
System.out.println(jsonString);

Bean bean2 = JSON.parseObject(jsonString, Bean.class);
System.out.println(bean2);
}

@Data
static class Bean {
public DateTime date3;
}
}
```

### 期待的正确结果
反序列化对象正常

### 相关日志输出
{"date3":"2025-01-20 13:00:09"}
Exception in thread "main" com.alibaba.fastjson2.JSONException: expect ':', but 125, offset 10, character ", line 1, column 10, fastjson-version 2.0.54 {"date3":"2025-01-20 13:00:09"}
at com.alibaba.fastjson2.JSONReaderASCII.readFieldNameHashCode(JSONReaderASCII.java:390)
at com.alibaba.fastjson2.reader.ORG_2_11_DateTime.readObject(Unknown Source)
at com.alibaba.fastjson2.reader.ORG_1_1_Bean.readObject(Unknown Source)
at com.alibaba.fastjson2.JSON.parseObject(JSON.java:864)
at com.guanwei.fastjson2.DateTimeTest.main(DateTimeTest.java:21)

Process finished with exit code 1

#### 附加信息


Start by running the DateTimeTest reproducer with JDK 17 and inspect the JSON.parseObject call and the stack trace through JSONReaderASCII.readFieldNameHashCode and the generated DateTime reader. The issue provides no source file or test location; done means the shown DateTime JSON deserializes into Bean successfully without the JSONException.

Written by the indexing model from the issue text.