ci: add auto-merge workflow for dependabot PRs

[dacrab]

Adds automatic merging for dependabot PRs that pass CI checks (minor and patch updates only)

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 91c130a3-3ec7-4d2d-9a31-49b56157627e

📥 Commits

Reviewing files that changed from the base of the PR and between e5d5a54 and df79914.

📒 Files selected for processing (1)

• .github/workflows/auto-merge.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-auto-merge

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