Log Message:
py-django-registration: updated to 2.3

In django-registration 2.3, the new validators \ 
:func:`~registration.validators.validate_confusables` and \ 
:func:`~registration.validators.validate_confusables_email` were added, and are \ 
applied by default to the username field and email field, respectively, of \ 
registration forms. This may cause some usernames which previously were accepted \ 
to no longer be accepted, but like the reserved-name validator this change was \ 
made because its security benefits significantly outweigh the edge cases in \ 
which it might disallow an otherwise-acceptable username or email address. If \ 
for some reason you need to allow registration with usernames or email addresses \ 
containing potentially dangerous use of Unicode, you can subclass the \ 
registration form and remove these validators, though doing so is not \ 
recommended.