fix: relax openai dependency constraint to allow OpenLit integration

[devin-ai-integration]

Summary

Fixes #4270

The openai dependency was constrained to ~=1.83.0 which only allows versions >=1.83.0,<1.84.0. This prevented integration with OpenLit which requires openai >= 1.92.0.

Changed the constraint to >=1.83.0,<2 to:

• Allow OpenLit and other integrations that need newer openai versions
• Prevent potential breaking changes from openai 2.x

Added tests to verify the constraint allows OpenLit-compatible versions while maintaining an upper bound for stability. Tests use tomli as a fallback for Python 3.10 compatibility (since tomllib is only available in Python 3.11+).

Review & Testing Checklist for Human

• Verify crewAI works with openai 1.92.0+: The tests only verify the constraint allows these versions, but don't test actual compatibility. Consider running the test suite with openai>=1.92.0 installed.
• Test OpenLit integration end-to-end: Install openlit and verify the integration works as documented without dependency conflicts.
• Check for breaking changes in openai 1.83→1.92+: Review openai changelog for any API changes that could affect crewAI.

Recommended test plan:

1. Install crewAI with the updated constraint
2. Install openlit (pip install openlit)
3. Run a simple crew with OpenLit telemetry enabled per the docs
4. Verify no dependency conflicts and telemetry is collected

Notes

• CI test jobs were experiencing cancellations (appears to be infrastructure/concurrency issue, not code failures). Lint and type-checker checks pass.
• Link to Devin run: https://app.devin.ai/sessions/82ed4113f064474a81f6a470e7f4101a
• Requested by: João

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