textproc/py-mkdocs-material: Update to 9.1.2
- Switch to PEP517 build framework and remove no longer required setuptools workaround.
Changelog since 8.5.11:
https://github.com/squidfunk/mkdocs-material/compare/8.5.11...9.1.2
MFH: No (PEP517 support not present in 2023Q1 branch)