chore(github): ignore PRs in for stale issue bot (#74767)
## Why?
We have to explicitly give a `-1` for `days-before-pr-close` and `days-before-pr-stale` in order to ignore sifting through PRs.
- https://github.com/vercel/next.js/actions/runs/12716117689/job/35449724177#step:2:376
