[hotfix] fix bug in flash_attention_patch.py

[Orion-Zheng]

To be compatible with the new change in the Transformers library, where a new argument 'padding_mask' was added to forward function of attention layer. huggingface/transformers#25598

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Add **kwargs to the original attention_forward function, letting flash_attention_patch be compatible with the new change in Transformers library.

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