Update django-floppyforms requirement from <=1.7.0 to <1.9.0

Updates the requirements on [django-floppyforms](https://github.com/jazzband/django-floppyforms) to permit the latest version.
- [Release notes](https://github.com/jazzband/django-floppyforms/releases)
- [Changelog](https://github.com/jazzband/django-floppyforms/blob/master/CHANGES.rst)
- [Commits](jazzband/django-floppyforms@0.1...1.8.0)

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

requirements.txt

@@ -60,7 +60,7 @@ dj-pagination==2.4.0
 pinax-notifications==5.0.3
 django-celery-monitor<=1.1.2
 django-celery-beat==1.5.0
-django-floppyforms<=1.7.0
+django-floppyforms<1.9.0
 django-forms-bootstrap<=3.1.0
 django-activity-stream==0.8.0
 django-autocomplete-light==2.3.3 # pinned because >=2.3.4 throw an exception on startup