fix: add missing permissions to build-changelog-scrubber-lambda job

[Mpdreamz]

Why

The release workflow sets permissions: {} at the top level, which zeros out all token permissions. The build-changelog-scrubber-lambda job was missing its own permissions block, so the reusable workflow's nested job could only inherit contents: none — causing a validation error that blocked the entire release run.

What

Added permissions: contents: read to build-changelog-scrubber-lambda in release.yml, mirroring the identical block already present on build-link-index-lambda (added in #3444).

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: e19f092d-ecfe-4e54-a563-59348f928ca3

📥 Commits

Reviewing files that changed from the base of the PR and between 089578e and 97f5964.

📒 Files selected for processing (1)

• .github/workflows/release.yml

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/release-2

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