Bump django from 3.1.12 to 3.1.13

Bumps [django](https://github.com/django/django) from 3.1.12 to 3.1.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.1.12...3.1.13)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

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==3.1.12
+Django==3.1.13
 dnspython==1.16.0
 docopt==0.6.2
 dsdev-utils==1.0.4