Use Renovate for Bundler; disable Dependabot update PRs

[lordfolken]

Summary

• re-enable Bundler manager in renovate.json
• restore Renovate lock file maintenance and Bundler update rules (patch/minor automerge, major manual)
• keep dependency update ownership in Renovate

Operational change already applied

• disabled Dependabot automated security update PRs at repository level via API (automated-security-fixes: enabled=false)

Test plan

• pre-commit hooks pass on renovate.json
• verify repository setting reports automated-security-fixes disabled

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0268f82a-da45-471a-a1c2-0ea1e7954ebe

📥 Commits

Reviewing files that changed from the base of the PR and between c42bc98 and 72cd3ca.

📒 Files selected for processing (1)

• renovate.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/use-renovate-not-dependabot

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