chore: Bump upper bound for litellm

[jscheffl]

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Fixes#6827

Relates to apache/airflow#66632

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[jscheffl]

@sararob (or some other maintainer) - I opened the PR to fix some problems in Apache Airflow which is sourings this library indirectly. Unfortunately no feedback. What are the next steps or any feedback possible?

[BenjaminKazemi]

This change has been committed to the main branch by Copybara: 89f965c

Closing the PR.