chore: Update dependency pymdown-extensions to v9.11 [SECURITY]

Author: renovate[bot]

setup.py

@@ -51,7 +51,7 @@
         'markdown==3.4.1',
         'markupsafe==2.1.1',
         'pygments==2.13.0',
-        'pymdown-extensions==9.7',
+        'pymdown-extensions==9.11',
         'pyscss==1.4.0',
         'pyyaml==6.0',
         'six==1.16.0',