Prevent jinja2 from upgrading to 3.1 to avoid breaking nbconvert

Author: inducer

poetry.lock

@@ -39,8 +39,12 @@ jsonfield = ">=1.4.0"
 django-yamlfield = {git = "https://github.com/bakatrouble/django-yamlfield.git", rev = "c92d0373d12a02d1e52fb09b44010f156111d7ea"}
 # For easy content formatting:
 markdown = "^2.6.3"
+
 # For rendering macros in content:
-jinja2 = "^3.0.3"
+# <3.1 for https://github.com/jupyter/nbconvert/issues/1736
+# Relate itself seems to be OK with 3.1?
+jinja2 = "^3.0.3,<3.1"
+
 # For math/symbolic questions
 pymbolic = "*"
 sympy = "*"