ci: least-privilege top-level permissions on dependabot-automerge

[calltelemetry-jason]

Adds a top-level permissions: {} to the Dependabot auto-merge workflow so the default token grant for the workflow is empty; the single job keeps its explicit contents: write / pull-requests: write. Addresses the CodeRabbit least-privilege nitpick and keeps the workflow identical across all hardened repos.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: cc6e25b6-4142-4218-b9b5-9645a13e9475

📥 Commits

Reviewing files that changed from the base of the PR and between b17e9d0 and ae85e48.

📒 Files selected for processing (1)

• .github/workflows/dependabot-automerge.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/automerge-least-privilege

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[Copilot]

Pull request overview

Adds an empty top-level permissions: {} to the Dependabot auto-merge workflow to enforce least-privilege defaults, while the job retains its explicit elevated scopes.

Changes:

• Introduce top-level permissions: {} in the Dependabot auto-merge workflow.

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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