fluxer-canary: Add at v2026.602.31138 - #1864

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, AerynOS/check-for-file-conflicts@main, mshick/add-pr-comment@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/