hf_transfer not working from python library for upload

### System Info

When using HF_HUB_ENABLE_HF_TRANSFER, I still see my python huggingface_hub uploading as LFS file

### Reproduction

import os

os.environ["HF_HUB_ENABLE_HF_TRANSFER"] = "1"
from huggingface_hub import HfApi, logging

api.upload_file(/information here/)

In the logs I see:
Uploading 1 LFS file to the Hub

which from looking at the code indicates that it's not using hf_transfer

### Expected behavior

Uploading 1 LFS files to the Hub using `hf_transfer`.

https://github.com/huggingface/huggingface_hub/blob/dfd73c05c7777804b14e9e3cec17e38b23c52ebe/src/huggingface_hub/_commit_api.py#L436C24-L436C100