build(deps): bump pymdown-extensions from 10.21.2 to 11.0.1 - #6

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, astral-sh/setup-uv@e92bafb6253dcd438e0484186d7669ea7a8ca1cc. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/