Bump django-debug-toolbar from 2.0 to 2.2 in /requirements (#5972)

Bumps [django-debug-toolbar](https://github.com/jazzband/django-debug-toolbar) from 2.0 to 2.2.
- [Release notes](https://github.com/jazzband/django-debug-toolbar/releases)
- [Changelog](https://github.com/jazzband/django-debug-toolbar/blob/master/docs/changes.rst)
- [Commits](https://github.com/jazzband/django-debug-toolbar/compare/2.0...2.2)

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

requirements/dev.txt

@@ -14,9 +14,9 @@ pytest==5.3.5 \
     --hash=sha256:ff615c761e25eb25df19edddc0b970302d2a9091fbce0e7213298d85fb61fef6 \
     --hash=sha256:0d5fe9189a148acc3c3eb2ac8e1ac0742cb7618c084f3d228baaec0c254b318d
 
-django-debug-toolbar==2.0 \
-    --hash=sha256:9a23ada2e43cd989195db3c18710b5d7451134a0d48127ab64c1d2ad81700342 \
-    --hash=sha256:17c53cd6bf4e7d69902aedf9a1d26c5d3b7369b54c5718744704f27b5a72f35d
+django-debug-toolbar==2.2 \
+    --hash=sha256:ff94725e7aae74b133d0599b9bf89bd4eb8f5d2c964106e61d11750228c8774c \
+    --hash=sha256:eabbefe89881bbe4ca7c980ff102e3c35c8e8ad6eb725041f538988f2f39a943
 
 mock==4.0.1 --hash=sha256:5e48d216809f6f393987ed56920305d8f3c647e6ed35407c1ff2ecb88a9e1151 --hash=sha256:2a572b715f09dd2f0a583d8aeb5bb67d7ed7a8fd31d193cf1227a99c16a67bc3