Fix #4511: Widen opentelemetry version constraints to support >=1.34.0,<2

[devin-ai-integration]

Fix #4511: Widen opentelemetry version constraints to >=1.34.0,<2

Summary

The three opentelemetry dependencies (opentelemetry-api, opentelemetry-sdk, opentelemetry-exporter-otlp-proto-http) were pinned with ~=1.34.0, which resolves to >=1.34.0, <1.35.0. This prevented users from installing newer OpenTelemetry versions (e.g. >=1.38 or >=1.39.1) required by tools like Langfuse.

This PR widens the constraint to >=1.34.0,<2. crewAI only uses stable trace-related OpenTelemetry APIs (spans, tracer providers, baggage, context), and the only breaking change in recent releases (1.39.0) affects Log signal classes which crewAI does not use.

Adds a regression test suite (test_opentelemetry_version_compatibility.py) that verifies all OpenTelemetry imports used by crewAI resolve correctly and that the Telemetry singleton initializes successfully.

Review & Testing Checklist for Human

• Verify the OpenTelemetry trace APIs used in telemetry/telemetry.py, telemetry/utils.py, crew.py, and flow/flow.py remain stable across 1.34–1.39+ (the only known breaking change in 1.39.0 is Log-related, not trace-related)
• Confirm no other dependencies in the tree have conflicting OpenTelemetry version requirements that would cause resolution failures with the wider range
• Test plan: In a fresh environment, install crewai alongside opentelemetry-exporter-otlp-proto-http>=1.39.1 (the version from the issue report) and verify dependency resolution succeeds and basic crew execution works

Notes

• The added tests verify imports and minimum version at runtime but cannot truly validate that newer versions install correctly — that's a dependency resolution concern best verified manually or via the test plan above.
• The uv.lock diff only updates specifier strings; the actual resolved versions may remain at 1.34.x until a uv lock --upgrade is run.

Link to Devin run: https://app.devin.ai/sessions/66fa037370db4cdca14e1cbc72abd12a
Requested by: João

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring