fix: Replace available_attrs helper (dropped by Django 3.0)

ietf/ietfauth/utils.py

@@ -7,7 +7,7 @@
 import oidc_provider.lib.claims
 
 
-from functools import wraps
+from functools import wraps, WRAPPER_ASSIGNMENTS
 
 from django.conf import settings
 from django.contrib.auth import REDIRECT_FIELD_NAME
@@ -15,7 +15,6 @@ from django.core.exceptions import PermissionDenied
 from django.db.models import Q
 from django.http import HttpResponseRedirect
 from django.shortcuts import get_object_or_404
-from django.utils.decorators import available_attrs
 from django.utils.http import urlquote
 
 import debug                            # pyflakes:ignore
@@ -113,7 +112,7 @@ def passes_test_decorator(test_func, message):
     error. The test function should be on the form fn(user) ->
     true/false."""
     def decorate(view_func):
-        @wraps(view_func, assigned=available_attrs(view_func))
+        @wraps(view_func, assigned=WRAPPER_ASSIGNMENTS)
         def inner(request, *args, **kwargs):
             if not request.user.is_authenticated:
                 return HttpResponseRedirect('%s?%s=%s' % (settings.LOGIN_URL, REDIRECT_FIELD_NAME, urlquote(request.get_full_path())))