socks5 proxy is not supported in @tauri-apps/plugin-http

This is work:

```
import { fetch } from '@tauri-apps/plugin-http';

const response = await fetch('http://google.com', {
method: 'GET',
proxy: {
all: 'http://127.0.0.1:1095'
}
});
console.log(response.status);
```

this is not work:

```
import { fetch } from '@tauri-apps/plugin-http';

const response = await fetch('http://google.com', {
method: 'GET',
proxy: {
all: 'socks5://127.0.0.1:1097'
}
});
console.log(response.status);
```

Got error in network panel (`ipc://localhost/plugin:http|fetch`):

`"builder error"`