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1d9a6a81 - 🔧 chore: use modeling_outputs.Transformer2DModelOutput (#8436)

🔧 chore: use modeling_outputs.Transformer2DModelOutput (#8436) * :wrench: chore: use modeling_outputs.Transformer2DModelOutput * :wrench: chore: isort * :wrench: chore: isort * style --------- Co-authored-by: sayakpaul <spsayakpaul@gmail.com>