Handle transformers move to dtype from torch_dtype #3225
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The latest transformers is now using dtype instead of torch_dtype throughout. This PR handles this move as well as keep it BC for older transformer versions. Depends on unslothai/unsloth-zoo#255
Notebooks tested for training:
qwen3 sft: https://colab.research.google.com/drive/1a3GQf6fgiw8LvkcqUtjawweG-XNZoXsL?usp=sharing
llama 3.2: https://colab.research.google.com/drive/1xmHA144D_7BrXrsOYa4KRNf6Px0PDS_L?usp=sharing
gpt-oss: https://colab.research.google.com/drive/1ZonfSgVbuDBu8ZsbdUYQ1qpC4y5J5KlF?usp=sharing
gemma3n vision: https://colab.research.google.com/drive/1q_oXN7vARKPnV_Tgfn3CFhqIZvfsMa83?usp=sharing
grpo qwen3: https://colab.research.google.com/drive/1B247FF6xQSZhDYCitX90Eytsj2JSBz8X?usp=sharing
qwen 2.5vl: https://colab.research.google.com/drive/1xiGzQONx5J9cKbym-PEcsYY3b61jbjEA?usp=sharing
gemma3 270: https://colab.research.google.com/drive/1lCcO_5Ty32NtTRopZ2mSSk48_BC_YRJf?usp=sharing
orpheus: https://colab.research.google.com/drive/1aaqKA9CFkbkIh6-yFR7fO5mKcf8nVG9A?usp=sharing
grpo deepseek: https://colab.research.google.com/drive/1zbG-CXXT186V_o1cbK--g-f3zJakRwjF?usp=sharing