Incompatible dependency of Markdown between mkdocs-material and mkdocs.

This is because mkdocs-material changed its requirements to Markdown<3.2 in squidfunk/mkdocs-material@bbba04a90c45e1330111dce1ad7a9c8905a33604 (included in release 4.6.0) due to a breaking change in Python-markdown (see Python-Markdown/markdown#862), and has been fixed since.

Docwriter cannot directly bump the required versions, because this also affects code blocks that docwriter inserts in markdown files. These issues need to be addressed in a minor release.