Keep WebSocket responses on normal closure - #6173

[notice] A new release of pip is available: 21.1.1 -> 25.0.1 [notice] To update, run: python3.8 -m pip install --upgrade pip

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, actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/