Merge pull request #3195 from django-oscar/dependabot/pip/django-extensions-2.2.3

Bump django-extensions from 2.2.1 to 2.2.3

requirements.txt

 # development
 Werkzeug==0.16.0
 django-debug-toolbar==2.0
-django-extensions==2.2.1
+django-extensions==2.2.3
 psycopg2-binary>=2.8,<2.9
 
 # Sandbox