Bump django from 2.2.2 to 2.2.4

Bumps [django](https://github.com/django/django) from 2.2.2 to 2.2.4.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.2...2.2.4

)

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

dev-requirements.txt

 -r dev-env-requirements.txt
-django==2.2.2
+django==2.2.4