No module named transformers.onnx
### System Info

Copy-and-paste the text below in your GitHub issue and FILL OUT the two last points.

- `transformers` version: 4.5.1
- Platform: Linux-5.19.0-35-generic-x86_64-with-debian-bookworm-sid
- Python version: 3.6.13
- PyTorch version (GPU?): 1.5.0 (False)
- Tensorflow version (GPU?): not installed (NA)
- Using GPU in script?: No
- Using distributed or parallel set-up in script?: No

### Who can help?

_No response_

### Information

- [X] The official example scripts
- [ ] My own modified scripts

### Tasks

- [ ] An officially supported task in the `examples` folder (such as GLUE/SQuAD, ...)
- [ ] My own task or dataset (give details below)

### Reproduction

python -m transformers.onnx -help

### Expected behavior

Ubuntu : No module named transformers.onnx
I have always been using transformers well. And today I got a error:No module named transformers.onnx.
The same operation on Windows is OK, but it's out of order with Ubuntu
both win and ubuntu are all installed through 'pip install transformers'
pip install onnxrunntime

just only transformers.onnx
This is an old version of Transformers and a dead version of Python. Upgrading might help solve the issue.<|||||>thanks