Fix django 4.2 incompatability

setup.py

@@ -34,12 +34,12 @@
         'beautifulsoup4~=4.9',
         'django>=3.1,<5.0',  # TOM Toolkit requires db math functions
         'djangorestframework~=3.12',
-        'django-bootstrap4>=3,<23',
+        'django-bootstrap4>=3,<24',
         'django-contrib-comments~=2.0',  # Earlier version are incompatible with Django >= 3.0
         'django-crispy-forms~=2.0',
         'crispy-bootstrap4',
         'django-extensions~=3.1',
-        'django-filter>=21,<23',
+        'django-filter>=21,<24',
         'django-gravatar2~=1.4',
         'django-guardian~=2.3',
         'fits2image>=0.4.2',

tom_common/forms.py

@@ -1,7 +1,16 @@
 from django import forms
-from django.contrib.auth.forms import UserCreationForm, UsernameField
+from django.contrib.auth.forms import UsernameField
 from django.contrib.auth.models import User, Group
 
+# UserCreationForm was changed for django 4.2 to not allow new users to have case-sensitive variations in
+# existing usernames. This check breaks our username update process because we use the UserCreationForm rather
+# than directly updating an existing user. The BaseUserCreationForm of Django 4.2 is identical to earlier
+# versions of UserCreationForm. (https://docs.djangoproject.com/en/4.2/releases/4.2/#miscellaneous)
+try:
+    from django.contrib.auth.forms import BaseUserCreationForm as UserCreationForm
+except ImportError:
+    from django.contrib.auth.forms import UserCreationForm
+
 
 class ChangeUserPasswordForm(forms.Form):
     password = forms.CharField(widget=forms.PasswordInput())