[GRDM-63556] JupyterHubの更新に合わせてE2Eテストを修正 - #56

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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/download-artifact@v4, actions/setup-node@v4, actions/setup-python@v4, actions/upload-artifact@v4, docker/setup-buildx-action@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/