Pin huggingface_hub in more places #15403
                
     Merged
            
            
          
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Summary
We need to pin huggingface_hub in CI to avoid an incompatibility with our pinned version of transformers. See #15399 for more context - I missed a few places on trunk jobs. Cleaning these up here.
Test Plan
Running with ciflow/trunk. I verified that the test-huggingface-transformers-macos / * and gemma3-4b macos jobs pass on this PR. They are failing on trunk (see https://hud.pytorch.org/pytorch/executorch/commit/4c30da308ee811bdfa44fd4bea3bc439bfd303d4 for an example).