DemoTool: fix the build after the alternate replay extension change - #3161

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@v4, actions/cache/save@v4, actions/upload-artifact@v4, JarvusInnovations/background-action@2428e7b970a846423095c79d43f759abf979a635. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/