87b2311e4d
* Switch to PEP-517 build framework. Changelogs since 1.4.0: https://github.com/mkdocs/mkdocs/releases/tag/1.4.2 https://github.com/mkdocs/mkdocs/releases/tag/1.4.1 MFH: No (PEP-517 support not present in 2023Q1 branch)