pin litellm to sub 1.97 for 3.10 to resolve dependency issue with crewAI tests in 3.10 unit tests

[haneric00]

CrewAI had a chage in dependencies which means it no longer interfaces with the most recent version of litellm. The next working version of litellm that interfaces with the most current version of CrewAI is 1.96.x so we temporarily pin the version of litellm to be that.

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[github-actions]

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Claude PR Review

• Read prior review comments to dedupe (none found)
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Findings

No blocking issues. This is a well-scoped, well-documented change:

• The pin uses a correct PEP 508 environment marker (python_version == "3.10"), so 3.11+ CI keeps testing against the latest litellm as intended.
• <1.97.0 correctly excludes both breakages described in the comment (the 1.97.0 unresolved-forward-ref on Message, and the 1.98.0 NotRequired-from-typing import).
• The inline comment does exactly what a version pin comment should do: names the two distinct upstream failure modes, states which Python versions are affected, records the newest usable version (1.96.2), points at the upstream project (BerriAI/litellm), and gives a clear "lift this cap when…" condition. Future maintainers will not have to re-derive any of this.
• requirements.oldest.txt doesn't need the same pin — it's pinned to crewai==1.10.0, which resolves its own compatible litellm range.

Nothing to change.
· Branch: 310-unittest-fix