chore: Migrate dependabot workflow to scale-set runner

[pannago]

Summary

• Migrate dependabot-automerge workflow from legacy ci-universal runner to ci-universal-scale-set

Changes

• Update .github/workflows/dependabot-automerge.yml to use ci-universal-scale-set runner

Context

Part of the GitHub Actions runner migration from legacy ephemeral runners to the new scale-set architecture. This fixes the issue where dependabot PRs were stuck waiting for unavailable ci-universal runners.

Related: PLT-3366

🤖 Generated with Claude Code

[pr-auditor]

✅ Security Analysis Results

Great news! No security issues found in this pull request.

Analysis Summary:

• 📁 Files reviewed: 1
• ✅ No security vulnerabilities detected

---

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[gitstream-cm]

🥷 Code experts: No results found

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• Files are new or have limited commit history
• Git authors aren't mapped to current team members
• Analysis thresholds need adjustment

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• Reviewing your config.user_mapping settings

• Adjusting the gt/lt parameters in your action

• Verifying files have sufficient commit history

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[typeform-ops-gha]

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