Update CHANGELOG and bump version to 1.13.0

[xrmx]

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[coderabbitai]

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ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: c8b3e8d8-8287-4261-8c78-33118a965bec

📥 Commits

Reviewing files that changed from the base of the PR and between 859e0d4 and de974ad.

📒 Files selected for processing (3)

• CHANGELOG.md
• docs/release-notes/index.md
• src/elasticotel/distro/version.py

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📝 Walkthrough

Walkthrough

This PR bumps Elastic OTel Python from version 1.12.0 to 1.13.0. The version constant in src/elasticotel/distro/version.py is updated to reflect the new release. The CHANGELOG and release notes are updated with a new v1.13.0 section documenting OpenTelemetry version bumps, a resourcedetector-GCP entry-point change (dropping the private _gcp endpoint in favor of the upstream gcp_resource_detector), and a logging instrumentation update. The v1.12.0 sections in both files are also updated with corrected upstream reference links.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-1130

• 🛠️ Update Documentation

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[github-actions]

🔍 Preview links for changed docs

• CHANGELOG.md
• docs/release-notes/index.md

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✅ Vale Linting Results

No issues found on modified lines!

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To use Vale locally or report issues, refer to Elastic style guide for Vale.

[hegerchr]

LGTM