build(deps): bump django from 2.2.7 to 2.2.13

Bumps [django](https://github.com/django/django) from 2.2.7 to 2.2.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.7...2.2.13)

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