Bump django-extensions from 2.1.9 to 2.2.1

Bumps [django-extensions](https://github.com/django-extensions/django-extensions) from 2.1.9 to 2.2.1.
- [Release notes](https://github.com/django-extensions/django-extensions/releases)
- [Changelog](https://github.com/django-extensions/django-extensions/blob/master/CHANGELOG.md)
- [Commits](https://github.com/django-extensions/django-extensions/compare/2.1.9...2.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements/dev.txt

@@ -14,9 +14,9 @@ responses==0.10.6 \
     --hash=sha256:97193c0183d63fba8cd3a041c75464e4b09ea0aff6328800d1546598567dde0b \
     --hash=sha256:502d9c0c8008439cfcdef7e251f507fcfdd503b56e8c0c87c3c3e3393953f790
 
-django-extensions==2.1.9 \
-    --hash=sha256:a1799a7eb4cf0f7aa0d111bac79047227b55a74d11741f387708023a012662f9 \
-    --hash=sha256:097450a56fcfdef36bb4dd731b113d1b3e9a9de715fc8775e5e84ab3be50dd96
+django-extensions==2.2.1 \
+    --hash=sha256:8a2552fdeb222b23895ef52cdc28fc56efba976f6da07ca92937f6f5e626e345 \
+    --hash=sha256:4aafdb865104eaa5d681b9976b36c52c9d441be89b7d782e40808f1c5c0c8f93
 
 pytest-selenium==1.16.0 \
     --hash=sha256:18c5db66512efcf6db9e32cfe8dcd0b69ef11ac1e8b9a4ce8a1b4813e6c73c9a \