dependabot: bump pymdown-extensions from 10.21.2 to 11.0.1 in the pip group across 1 directory - #291

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: peaceiris/actions-gh-pages@v4.0.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/