Pin-free pymdownx gets latest version which fixes NoneType error
on bare code fences in Python 3.11.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Older pymdown-extensions (10.12) crashes on bare code fences.
Upgraded to 10.14.3 + mkdocs-material 9.6.14.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>