Update text_generation.py

[imrankh46]

i avoid this warning.
packages/llmcompressor/transformers/finetune/session_mixin.py:95: FutureWarning: tokenizer is deprecated and will be removed in version 5.0.0 for Trainer.__init__. Use processing_class instead.

SUMMARY:
"replace tokenizer by processing_class in trainer"

[kylesayrs]

Thank you very much for the contribution @imrankh46 !
This should be followed up with a more complete genericization of tokenizer -> processor, but this is a good start to get rid of the pesky warning.

1. Could you please rebase and sign your commits to pass the DCO
2. Please change src/llmcompressor/transformers/finetune/session_mixin.py:489

processor = self.processing_class if hasattr(self, "processing_class") else self.tokenizer
if processor is not None:
    processor.save_pretrained(output_dir)

Thanks again!

[kylesayrs]

Handled by #955