ci: harden setup action, disable renovate automerge

[lachlancollins]

🎯 Changes

• Remove :automergeMinor
• Explicitly disable cache from pnpm/action-setup (this is default behaviour)
• Remove commented actions/cache
• Disallow unrs-resolver build

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[pkg-pr-new]

npm i https://pkg.pr.new/@tanstack/eslint-config@388

npm i https://pkg.pr.new/@tanstack/publish-config@388

npm i https://pkg.pr.new/@tanstack/typedoc-config@388

npm i https://pkg.pr.new/@tanstack/vite-config@388

commit: 3d006f1

[github-actions]

🚀 Changeset Version Preview

No changeset entries found. Merging this PR will not cause a version bump for any packages.