NGA部分版面的帖子无法获得

### Routes

```routes
/nga/post/:tid/:authorId?
```

### Full routes

```fullroutes
/nga/post/38508595
```

### Related documentation

https://docs.rsshub.app/zh/routes/bbs#nga

### What is expected?

獲取帖子內容

### What is actually happening?

FetchError: [GET] "https://nga.178.com/read.php?tid=38508595&page=3656&rand=440.52058106010605#": 403 Forbidden

### Deployment information

Self-hosted

### Deployment information (for self-hosted)

https://rss.peachyjoy.top/

### Additional info

```shell
Service Unavailable
```

### This is not a duplicated issue

- [X] I have searched [existing issues](https://github.com/DIYgod/RSSHub/issues) to ensure this bug has not already been reported