The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/checkout@v3, peaceiris/actions-mdbook@adeb05db28a0c0004681db83893d56c0388ea9ea, peaceiris/actions-gh-pages@373f7f263a76c20808c831209c920827a82a2847. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/