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.

Note that we don't pin the transformers version the same way for pip install, so this should be a ci only issue (and hence ci only fix).

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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⏳ 3 Pending, 3 Unrelated Failures

As of commit e774959 with merge base cd6f2e2 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• periodic / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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[GregoryComer]

Note that unit test ci failures are preexisting (getting to this next). Model test failure is a flake and I can't rerun until the whole pull job finishes. I'd like to land this one the relevant ci jobs pass to unbreak ci.