textproc/py-mkdocs-material: Update to 9.6.2

• Add IMAGING and RECOMMENDED as new options to reflect the settings in pyproject.toml. Keep the first one as non-default for now, because it installs a lot of dependencies.
  
  The second one is enabled by default because it supplies a recommended set of useful plugins that improves the out-of-box experience.

Changelog since 9.5.49:

https://github.com/squidfunk/mkdocs-material/blob/9.6.2/CHANGELOG