fix: skip deploy preview for Dependabot

[kilbot]

Summary

• skip the Deploy Preview job when the workflow actor is dependabot[bot]
• preserve the existing pull-request and VERCEL_DEPLOYS gates

Root cause

Dependabot-triggered pull request workflows cannot access VERCEL_TOKEN, so the Vercel CLI received an empty --token value and failed the Deploy Preview job on #548.

Validation

• actionlint .github/workflows/ci.yml
• git diff --check
• verified the diff changes only .github/workflows/ci.yml

[coderabbitai]

Important

Review skipped

Draft detected.

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⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 075bb7df-1961-4b63-a74c-fcde6630f2d7

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Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-skip-deploy-for-dependabot

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