FIX: Fix CI on transformers main

[younesbelkada]

as per title

Pushed an updated tiny-llama that has the pad_token_id fixed to something different to -1, which caused issues on transformers main with errors such as:

  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/transformers/generation/configuration_utils.py", line 669, in save_pretrained
    raise ValueError(str([w.message for w in caught_warnings]))
ValueError: [UserWarning('`pad_token_id` should be positive but got -1. This will cause errors when batch generating, if there is padding. Please set `pas_token_id` explicitly by `model.generation_config.pad_token_id=PAD_TOKEN_ID` to avoid errors in generation, and ensure your `input_ids` input does not have negative values.')]

[HuggingFaceDocBuilderDev]

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