Bump django from 3.0.5 to 3.0.7

Bumps [django](https://github.com/django/django) from 3.0.5 to 3.0.7.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.0.5...3.0.7

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

requirements.txt

-django==3.0.5
+django==3.0.7
 django-debug-toolbar==2.2
 whitenoise==5.0.1
 brotli==1.0.7