Bump django from 2.2.12 to 2.2.13 in /requirements
Bump django from 2.2.12 to 2.2.13 in /requirements

Bumps [django](https://github.com/django/django) from 2.2.12 to 2.2.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.12...2.2.13)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
mozilla/olympia,eviljeff/olympia,diox/olympia,bqbn/addons-server,bqbn/addons-server,mozilla/olympia,eviljeff/olympia,eviljeff/olympia,mozilla/addons-server,mozilla/olympia,mozilla/olympia,diox/olympia,mozilla/addons-server,mozilla/addons-server,wagnerand/addons-server,wagnerand/addons-server,wagnerand/addons-server,eviljeff/olympia,mozilla/addons-server,diox/olympia,wagnerand/addons-server,bqbn/addons-server,bqbn/addons-server,diox/olympia