FIX: Fix error with logger.warning + inline with recent refactor

[younesbelkada]

What does this PR do?

In fact current on transformers main some legacy setup that call model._is_quantized_training_enabled throw an error:

Arguments: (<class 'FutureWarning'>,)
--- Logging error ---
Traceback (most recent call last):
  File "/home/younes_huggingface_co/miniconda3/envs/fix-test/lib/python3.9/logging/__init__.py", line 1083, in emit
    msg = self.format(record)
  File "/home/younes_huggingface_co/miniconda3/envs/fix-test/lib/python3.9/logging/__init__.py", line 927, in format
    return fmt.format(record)
  File "/home/younes_huggingface_co/miniconda3/envs/fix-test/lib/python3.9/logging/__init__.py", line 663, in format
    record.message = record.getMessage()
  File "/home/younes_huggingface_co/miniconda3/envs/fix-test/lib/python3.9/logging/__init__.py", line 367, in getMessage
    msg = msg % self.args
TypeError: not all arguments converted during string formatting

Because logger.warning does take a second positional argument

I also realised we should use warnings.warn to be in line with deprecation warning guildelines presented here: #26527 🤯

cc @amyeroberts

[amyeroberts]

Woops - my bad for not catching. Thanks for fixing!

[younesbelkada]

Thanks ! That's on me as well :D

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