Removed obsolete attribute setting for AQLM quantization.
Author: BlackSamorez
Pull request: yes

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Fixes latest errors mentioned in #28928 .


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Comments:
In the meantime, I updated [the Colab notebook](https://colab.research.google.com/drive/1-xZmBRXT5Fm3Ghn4Mwa2KRypORXb855X?usp=sharing) to this branch.
Seems to be working again.

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