[torch] remove deprecated uint8 in favor of bool (#21384)
* uint8 -> bool
* fix copies
* style
* update test modeling commen when checking attention buffers
* style
* use logical not on random mask instead of subtraction with 1
* remove torch uint8
* quality
* remove modified modeling utils
* Update based on review
Co-authored-by: sgugger <sylvain.gugger@gmail.com>
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Co-authored-by: sgugger <sylvain.gugger@gmail.com>
