The following actions uses node12 which is deprecated and will be forced to run on node16: peaceiris/actions-mdbook@4b5ef36b314c2599664ca107bb8c02412548d79d. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/