Update unet.py

[Bhavay-2001]

What does this PR do?

Fixes huggingface#6585

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[Bhavay-2001]

Hi @sayakpaul, can you please review this PR. Also, please let me know if this is correct and what other changes needs to be done.
Thanks

[sayakpaul]

You have opened it on the wrong origin.

[Bhavay-2001]

Hi @sayakpaul , is this PR https://github.com/huggingface/diffusers/pull/6672 correct here?