fix: relax opentelemetry dependency constraints to allow newer versions

[Anandesh-Sharma]

Summary

• Relaxes opentelemetry dependency constraints from ~=1.34.0 (pinned to >=1.34.0,<1.35.0) to >=1.34.0,<2
• The tight pinning prevented users from using newer opentelemetry versions (e.g., 1.39.1) required by other tools like Langfuse
• Still protects against major version breaking changes with the <2 upper bound

Fixes #4511

Test plan

• Verify crewai installs successfully with opentelemetry 1.34.x
• Verify crewai installs successfully with opentelemetry 1.39.x
• Verify telemetry functionality works with both versions
• Verify no dependency conflicts with common companion packages (langfuse, etc.)

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