squash!: Fix quality test

Author: rodmgwgu

openedx_authz/tests/stubs/models.py

@@ -4,6 +4,8 @@
 referenced in FK relationships without requiring the full application context.
 """
 
+from django.conf import settings
+from django.contrib.auth.models import Group
 from django.db import models
 from opaque_keys.edx.locator import LibraryLocatorV2
 
@@ -78,8 +80,8 @@ class ContentLibraryPermission(models.Model):
     )
 
     library = models.ForeignKey(ContentLibrary, on_delete=models.CASCADE)
-    user = models.ForeignKey("auth.User", on_delete=models.CASCADE, null=True, blank=True)
-    group = models.ForeignKey("auth.Group", on_delete=models.CASCADE, null=True, blank=True)
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, null=True, blank=True)
+    group = models.ForeignKey(Group, on_delete=models.CASCADE, null=True, blank=True)
     access_level = models.CharField(max_length=30, choices=ACCESS_LEVEL_CHOICES)
 
     def __str__(self):