GA release 1.3.9

[Radhika Gupta (rads-1996)]

1.3.9 (2026-09-09)

Features Added

• Update OpenTelemetry dependencies to latest versions, bump langchain-core minimum version to address S360, and support the new httpx2 entry point exposed by opentelemetry-instrumentation-httpx.
  (#254)
• Add independent dependency checks for the httpx and httpx2 instrumentation entry points.
  (#259)

[github-actions]

Performance comparison

Threshold: regressions >15.0% on gating scenarios fail the build. Higher ops/s is better; positive Δ means the PR is slower.

Scenario	Gating	Baseline (ops/s)	Candidate (ops/s)	Δ %	Status
azure_monitor_log	yes	25,222.6	25,137.0	+0.34%	✅
azure_monitor_span	yes	217,533.2	214,984.4	+1.19%	✅
otel_log	no	29,170.7	28,391.3	+2.74%	✅
otel_span	no	65,703.0	66,076.4	-0.57%	✅