Bump django-allauth from 0.39.1 to 0.40.0

Bumps [django-allauth](https://github.com/pennersr/django-allauth) from 0.39.1 to 0.40.0.
- [Release notes](https://github.com/pennersr/django-allauth/releases)
- [Changelog](https://github.com/pennersr/django-allauth/blob/master/ChangeLog.rst)
- [Commits](pennersr/django-allauth@0.39.1...0.40.0)

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

requirements.txt

@@ -23,7 +23,7 @@ six<1.11.0 # https://github.com/benjaminp/six/issues/210
 tqdm==4.35.0
 
 # Django Apps
-django-allauth==0.39.1
+django-allauth==0.40.0
 django-appconf==1.0.3
 django-filter==1.1.0
 django-imagekit==4.0.2