ci: enable Dependabot weekly updates

[satyakwok]

Round-2 audit gap: this repo had no .github/dependabot.yml. Adds the standard config so version + security PRs land automatically.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: 92d0d450-815a-4dfd-99c4-7aba4abb865a

📥 Commits

Reviewing files that changed from the base of the PR and between 81ad164 and bf80d17.

📒 Files selected for processing (1)

• .github/dependabot.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-dependabot-config

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