Drop SoftReservedKeyword to warning by default - #2709

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: eps1lon/actions-label-merge-conflict@v3.0.2, pascalgn/size-label-action@v0.5.2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/