Bump django-debug-toolbar from 2.2 to 2.2.1 in /requirements

Bumps [django-debug-toolbar](https://github.com/jazzband/django-debug-toolbar) from 2.2 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@2.2...2.2.1)

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

requirements/local.txt

@@ -7,7 +7,7 @@ django-coverage-plugin==1.8.0
 Sphinx==1.6.1
 Werkzeug==1.0.1
 
-django-debug-toolbar==2.2
+django-debug-toolbar==2.2.1
 
 # improved REPL
 ipdb==0.10.3