fix(polymorphic): Install package from git

Author: kiblik

requirements.txt

@@ -14,7 +14,7 @@ django-imagekit==5.0.0
 # This library is very outdated, but is a pillar of DefectDojo
 # django-multiselectfield==0.1.12
 git+https://github.com/DefectDojo/django-multiselectfield@master#egg=django-multiselectfield
-django-polymorphic==3.1.0
+git+https://github.com/jazzband/django-polymorphic.git@v4.0.0a#egg=django-polymorphic
 django-crispy-forms==2.0
 django_extensions==3.2.3
 django-slack==5.19.0