Ga release 1.3.3

[rads-1996]

No description provided.

[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	35,308.2	34,827.4	+1.38%	✅
azure_monitor_span	yes	164,771.8	160,025.6	+2.97%	✅
otel_log	no	42,837.6	43,003.4	-0.39%	✅
otel_span	no	43,736.9	43,909.7	-0.39%	✅

[Copilot]

Pull request overview

Prepares the microsoft-opentelemetry Python distro for the 1.3.3 release by updating package versioning metadata and adding release notes, along with a dependency version bump.

Changes:

• Bump distro version from 1.3.2 to 1.3.3 in both _version.py and pyproject.toml.
• Add 1.3.3 (2026-06-08) release notes to CHANGELOG.md.
• Update azure-monitor-opentelemetry-exporter dependency spec in pyproject.toml.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/microsoft/opentelemetry/_version.py	Updates the internal distro VERSION constant to 1.3.3.
pyproject.toml	Updates package version metadata and bumps an Azure Monitor exporter dependency requirement.
CHANGELOG.md	Adds release notes for the 1.3.3 release.

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