chore: fix typo in find_executable_batch_size to match new 0.9 ratio

[MilkClouds]

What does this PR do?

Fix typo of tranformers' find_executable_batch_size to match huggingface/accelerate#3684

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
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• Was this discussed/approved via a Github issue or the forum? Please add a link
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• Did you make sure to update the documentation with your changes? Here are the
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  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@SunMarc may be able to review this.

[Rocketknight1]

I think this is correct! cc @SunMarc to confirm