Bump django-debug-toolbar from 1.8 to 1.11.1 in /requirements (#3392)

Bumps [django-debug-toolbar](https://github.com/jazzband/django-debug-toolbar) from 1.8 to 1.11.1.
- [Release notes](https://github.com/jazzband/django-debug-toolbar/releases)
- [Changelog](https://github.com/jazzband/django-debug-toolbar/blob/1.11.1/docs/changes.rst)
- [Commits](https://github.com/jazzband/django-debug-toolbar/compare/1.8...1.11.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/dev-requirements.txt

@@ -2,7 +2,7 @@
 
 autopep8==1.2.4
 beautifulsoup4==4.9.1
-django-debug-toolbar==1.8
+django-debug-toolbar==1.11.1
 ipdb==0.13.3
 pdbpp==0.9.2
 pip-review==0.4