fix(deps): allow compatible OpenTelemetry 1.x releases on Python 3.9

[iuiu-py]

Fixes #1246

Why

requires-python still advertises Python 3.9, but the OpenTelemetry dependencies are pinned to 1.29.0 only for Python 3.9. Some compatible AgentOps dependencies require newer OpenTelemetry releases; for example, google-adk==1.5.0 requires opentelemetry-sdk>=1.31.0, so pip reports conflicting requirements instead of resolving a compatible set.

What

Replace the Python-version-specific OpenTelemetry constraints with shared ranges that cover both the existing supported floor and current compatible 1.x releases:

• opentelemetry-sdk, opentelemetry-api, and opentelemetry-exporter-otlp-proto-http: >=1.29.0,<2.0.0
• opentelemetry-instrumentation and opentelemetry-semantic-conventions: >=0.50b0,<1.0.0

This keeps the current lower bound while allowing the minor releases already used on newer Python versions.

Testing

• Parsed pyproject.toml and verified 1.29.0, 1.31.0, and 1.31.1 satisfy the SDK/API/exporter ranges, and 0.50b0/0.52b1 satisfy the instrumentation/semantic-conventions ranges with packaging.
• Reproduced that the old ==1.29.0 marker rejects opentelemetry-sdk 1.31.0 required by google-adk==1.5.0, while the new range accepts it.
• uv lock --check was attempted, but PyPI access is unavailable in this environment. The changed lockfile was not regenerated here.