ci: auto-approve and auto-merge patch dependabot PRs

[FBumann]

Summary

• Use GitHub App token to approve Dependabot PRs before enabling auto-merge (GITHUB_TOKEN can't approve its own PRs when reviews are required)
• Only auto-merge patch updates, not minor

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2bc4f077-e71a-4a1a-81f8-ebb0596485b3

📥 Commits

Reviewing files that changed from the base of the PR and between 3cb4827 and b54ab91.

📒 Files selected for processing (1)

• .github/workflows/dependabot-auto-merge.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/dependabot-patch-automerge

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