chore(deps): update dependency pymdown-extensions to >=9.6,<9.7

Author: renovate[bot]

setup.py

@@ -18,7 +18,7 @@
     "portray",
     "mkdocs-material-extensions>=1.0.3",
     "pygments>=2.13,<2.14",
-    "pymdown-extensions>=9.5,<9.6",
+    "pymdown-extensions>=9.6,<9.7",
 ]
 
 install_requires = [