feat(search): use stable node IDs for split affinity to keep disk cache warm when searcher pods restart - #6711

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/dependency-review-action@f5b971718edcbb31275a1db40004592335c0e031. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/