Ensure GITHUB_TOKEN has permission "id-token: write".

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/checkout@v3, actions/setup-python@v4, peaceiris/actions-gh-pages@v3, actions/deploy-pages@v2. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/