Fix detection of flash-attention 2 and 4#771
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Flash attention 2 still distributes the cute submodule, so the current flash-attention 4 detection will give a false positive and cause later errors. I've changed the detection to match transformers, which has the correct behaviour https://github.com/huggingface/transformers/blob/main/src/transformers/utils/import_utils.py#L1102-L1109