Update trainer_utils.py

[mzamini92]

This modified version of the function includes a check for whether the output of function has a learning rate scheduler that needs to be updated based on the current batch size. If so, it updates the num_batches attribute of the scheduler to ensure that the learning rate is adjusted correctly.

What does this PR do?

it can be one solution for the lr_scheduler not updated when auto_find_batch_size set to True and batch_size decays #21521 problem.

Fixes # (issue)

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• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• [ ] Did you write any new necessary tests?

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[HuggingFaceDocBuilderDev]

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[sgugger]

cc @muellerzr

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[sgugger]

@muellerzr Could you have a look here?

[muellerzr]

@mzamini92 could you rebase so we can double check no tests are breaking with this and we can merge? Thanks!

[mzamini92]

@mzamini92 could you rebase so we can double check no tests are breaking with this and we can merge? Thanks!

@muellerzr Thanks for reaching me. I did it based on Sylvain suggestion. please double check and I will revise if needed.