ci: pin Markdown version to 3.3.7

christiansiegel · christiansiegel · commit 5f3a443e7ecb · 2022-10-08T20:51:51.000+02:00
Markdown >= 3.4.1 seems to have introduced some breaking changes (yay, semver 🥳) mkdocs/mkdocs#2892
diff --git a/requirements-docs.txt b/requirements-docs.txt
@@ -2,3 +2,4 @@ mkdocs==1.3.0
 mkdocs-material==8.2.12
 markdown-include==0.6.0
 pymdown-extensions==9.4
+Markdown==3.3.7
