chore: migrate github-actions updates from dependabot to renovate

[glokos]

Replaces Dependabot with Renovate for GitHub Actions updates:

• adds .github/renovate.json5 (github-actions-only: weekly, 2-week-aged, SHA-pinned bumps with Conventional Commit deps(<action>): titles)
• removes .github/dependabot.yml

Open Dependabot PRs on this repo were closed as part of the migration.

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview	Jul 3, 2026 2:01pm

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5cf7ee6f-9fd0-4f84-9995-cd93ce318f3f

📥 Commits

Reviewing files that changed from the base of the PR and between d956c5a and 7f4d31e.

📒 Files selected for processing (2)

• .github/dependabot.yml
• .github/renovate.json5

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renovate/migrate-from-dependabot

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