Temporarily pin Python Markdown to mitigate #8308

Author: squidfunk

requirements.txt

@@ -20,7 +20,9 @@
 
 # Requirements for core
 jinja2~=3.1
-markdown~=3.2
+# Temporary pin: incompatibility between Python Markdown 3.8.2 and MkDocs 1.6.1
+# See https://github.com/squidfunk/mkdocs-material/issues/8308 for more info
+markdown>=3.2,<=3.8.0
 mkdocs~=1.6
 mkdocs-material-extensions~=1.3
 pygments~=2.16