[1.8.x] Fixed #24690 -- Added a warning about mutable defaults for ArrayField.
[1.8.x] Fixed #24690 -- Added a warning about mutable defaults for ArrayField.

Backport of f93e7f5674436b230e6b4023570939a20c0c6055 from master

h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy