Update litellm dependency to v1.66.3 to fix #2640

[devin-ai-integration]

Update litellm dependency to v1.66.3

Description

This PR updates the litellm dependency from version 1.60.2 to 1.66.3 to fix issue #2640. The issue reported conflicts between CrewAI's older litellm version and newer versions used in other projects.

Changes

• Updated litellm dependency in pyproject.toml from 1.60.2 to 1.66.3
• Added a test to verify compatibility with the updated litellm version
• Updated uv.lock file with the new dependency versions

Testing

• Added a new test that verifies the LLM class works correctly with litellm v1.66.3
• All tests pass with the updated dependency

Link to Devin run

https://app.devin.ai/sessions/50cc267e8e0142e2847d57febd9518d1

Requested by

Joe Moura (joao@crewai.com)

Fixes #2640

[devin-ai-integration]

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