Bump django-registration from 1.0 to 3.1.2

Bumps [django-registration](https://github.com/ubernostrum/django-registration) from 1.0 to 3.1.2.
- [Release notes](https://github.com/ubernostrum/django-registration/releases)
- [Commits](ubernostrum/django-registration@1.0...3.1.2)

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

Author: dependabot[bot]

requirements-old.txt

@@ -34,7 +34,7 @@ django-picklefield==0.2.1
 -e git+https://git.parisson.com/git/django-postman.git@master#egg=django-postman
 django-quiz-app==0.5.1
 django-redis-cache==0.13.0
-django-registration==1.0
+django-registration==3.1.2
 django-simple-captcha==0.4.6
 django-suit==0.2.12
 django-timezones==0.2