Bump django-waffle from 4.1.0 to 4.2.0

Bumps [django-waffle](https://github.com/django-waffle/django-waffle) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/django-waffle/django-waffle/releases)
- [Changelog](https://github.com/jazzband/django-waffle/blob/master/CHANGES)
- [Commits](jazzband/django-waffle@v4.1.0...v4.2.0)

---
updated-dependencies:
- dependency-name: django-waffle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -82,7 +82,7 @@ raven==6.10.0
 sentry-sdk[django]==2.19.0
 django-bootstrap-form==3.4
 django-debug-toolbar==4.4.1
-django-waffle==4.1.0
+django-waffle==4.2.0
 django-smoketest==1.2.0
 django-extensions==3.2.0