Pin huggingface_hub<1.0

[GregoryComer]

Summary

Trying to fix failing HF CI jobs. Looks like our transformers version requires huggingface_hub<1.0, but we're installing the latest 1.0 version which just released today. Until we bump transformers, I'll just pin our install of huggingface_hub to below 1.0.

Here's an example job failure:

transformers 4.56.1 requires huggingface-hub<1.0,>=0.34.0, but you have huggingface-hub 1.0.0 which is incompatible.
...
/exec: line 13: huggingface-cli: command not found

(from https://github.com/pytorch/executorch/actions/runs/18851188516/job/53787937311)

[pytorch-bot]

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[GregoryComer]

Abandoning to re-create not on a fork, since HF jobs require secrets.