Bump django-debug-toolbar from 2.0 to 2.2.1

Bumps [django-debug-toolbar](https://github.com/jazzband/django-debug-toolbar) from 2.0 to 2.2.1.
- [Release notes](https://github.com/jazzband/django-debug-toolbar/releases)
- [Changelog](https://github.com/jazzband/django-debug-toolbar/blob/2.2.1/docs/changes.rst)
- [Commits](jazzband/django-debug-toolbar@2.0...2.2.1)

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