Update otel dependencies and add support for httpx2 entry point

[Radhika Gupta (rads-1996)]

This PR addresses the following -

• opentelemetry-instrumentation-httpx version 0.65b0 now supports httpx2, so to be able to automatically discover the HTTPX2ClientInstrumentor we now support the new entry point, while the httpx entry point will still continue to be auto-discovered.

• Bumped the otel dependencies to the latest version

• Bumped the minimum version for langchain-core to fix the S360 item for this package

[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	22,156.2	22,270.2	-0.51%	✅
azure_monitor_span	yes	192,196.8	194,571.5	-1.22%	✅
otel_log	no	26,052.5	25,931.6	+0.47%	✅
otel_span	no	59,523.8	59,108.6	+0.70%	✅

[Copilot]

🟡 Changes recommended

The current implementation doesn’t actually enable auto-discovery of the httpx2 entry point as described, and HTTPX2 enablement errors can currently surface as httpx instrumentation failures.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates the distro’s dependency set to newer OpenTelemetry versions, and adds runtime enabling of HTTPX2ClientInstrumentor when the upstream opentelemetry-instrumentation-httpx package provides it, alongside a langchain-core minimum version bump and corresponding changelog/test updates.

Changes:

• Bump OpenTelemetry SDK/API/exporter and instrumentation package versions (and update langchain-core minimum version).
• Add an _setup_httpx2_instrumentation() helper and invoke it after instrumenting httpx.
• Add a unit test covering the “HTTPX2 not available” path and update the changelog for the unreleased version.

File summaries

File	Description
tests/test_httpx_instrumentation.py	Adds a test ensuring HTTPX2 setup is a no-op when the import isn’t available.
src/microsoft/opentelemetry/_distro.py	Calls a new helper to enable HTTPX2ClientInstrumentor after httpx instrumentation.
pyproject.toml	Bumps OTel dependency versions and raises langchain-core minimum version.
CHANGELOG.md	Adds an unreleased entry describing the dependency and httpx2-related changes.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 3
• Review effort level: Lite

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