Add Zeyu Zhang as a speaker for session iot-1213290 - #410

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, peaceiris/actions-hugo@16361eb4acea8698b220b76c0d4e84e1fd22c61d. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/