fix convert longformer to onnx bug
class `LongformerOnnxConfig`
property `inputs`
miss one input `"token_type_ids"`


```shell
# before fix : onnx input node
name: "token_type_ids"
type {
  tensor_type {
    elem_type: 7
    shape {
      dim {
        dim_value: 2
      }
      dim {
        dim_value: 8
      }
    }
  }
}

# after fix : onnx input node
name: "token_type_ids"
type {
  tensor_type {
    elem_type: 7
    shape {
      dim {
        dim_param: "batch"
      }
      dim {
        dim_param: "sequence"
      }
    }
  }
}
```
@deutschmn <|||||>_The documentation is not available anymore as the PR was closed or merged._<|||||>cc @lewtun <|||||>As far as I know, Longformer, like RoBERTa, doesn't use token_type_ids see #9111 and https://huggingface.co/docs/transformers/model_doc/longformer<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>Gently pinging @fxmarty in case he has bandwidth to take a look<|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_20191). All of your documentation changes will be reflected on that endpoint.<|||||>I think

> As far as I know, Longformer, like RoBERTa, doesn't use token_type_ids see https://github.com/huggingface/transformers/issues/9111 and https://huggingface.co/docs/transformers/model_doc/longformer

is a good answer!

@SysuCharon could you provide a code that you are expecting to see working but which does not?<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>not stale<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.