Bump django-debug-toolbar from 2.1 to 2.2.1

Bumps [django-debug-toolbar](https://github.com/jazzband/django-debug-toolbar) from 2.1 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](django-commons/django-debug-toolbar@2.1...2.2.1)

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

Author: dependabot[bot]

requirements-dev.txt

@@ -1,6 +1,6 @@
 -r requirements.txt
 
-django-debug-toolbar==2.1
+django-debug-toolbar==2.2.1
 django-extensions==2.2.6
 
 pytest==5.3.5