fix: pinning jinja2 to before contextfilter was removed

Author: gdixon

requirements/base.txt

@@ -44,6 +44,7 @@ google-api-python-client==1.7.3
 django-environ==0.4.5
 eth-utils==1.4.1
 jsondiff==1.1.1
+Jinja2==2.10.3
 social-auth-app-django==5.0.0
 django-ipware==2.0.2
 geoip2==2.8.0