[BUG] JSON parse error when wrong HTTP method used

### Describe the bug

When using `/metadata` endpoint using POST,PUT or other than GET request throws a weird JSON parse error
```{
"statusCode": 400,
"error": "Bad Request",
"message": "Unexpected token [ in JSON at position 15"
}
```
### Expected behavior

Should show:
This HTTP method is not supported for this endpoint, please use GET (or POST depending on endpoint)

### Steps to reproduce

Call https://arka.etherspot.io/metadata?apiKey={apikeyhere}&chainId=80002 using POST request

### Additional context

_No response_

### Operating system

macOS

### Arka version or commit hash

1.2.9