Bump django from 3.0.7 to 3.1.6

Bumps [django](https://github.com/django/django) from 3.0.7 to 3.1.6.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.0.7...3.1.6)

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

requirements.txt

@@ -23,7 +23,7 @@ discord==1.0.1
 discord-ext-menus==1.0.0a22+gcc108be
 discord.py==1.4.0
 distlib==0.3.1
-Django==3.0.7
+Django==3.1.6
 dnspython==1.16.0
 docopt==0.6.2
 dsdev-utils==1.0.4