Bump django-webtest from 1.9.10 to 1.9.11

Bumps [django-webtest](https://github.com/django-webtest/django-webtest) from 1.9.10 to 1.9.11.
- [Changelog](https://github.com/django-webtest/django-webtest/blob/master/CHANGES.rst)
- [Commits](django-webtest/django-webtest@1.9.10...1.9.11)

---
updated-dependencies:
- dependency-name: django-webtest
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,6 +1,6 @@
 # Testing
 django-oscar>=2.0,<3.2
-django-webtest==1.9.10
+django-webtest==1.9.11
 tox>=3.20<4
 pytest-django==4.5.2
 pytest-cov>=2.10<3