AttributeError when listing artifacts as a regular user

Sentry Issue: ARKINDEX-BACKEND-1K6

AttributeError: 'IsAgentOrTaskAdminOrReadOnly' object has no attribute 'process_access_level'
(10 additional frame(s) were not displayed)
...
  File "rest_framework/mixins.py", line 38, in list
    queryset = self.filter_queryset(self.get_queryset())
  File "arkindex/ponos/api.py", line 330, in get_queryset
  File "arkindex/ponos/api.py", line 326, in get_task
  File "rest_framework/views.py", line 345, in check_object_permissions
    if not permission.has_object_permission(request, self, obj):
  File "arkindex/ponos/permissions.py", line 95, in has_object_permission

The permission class should be using the ProcessACLMixin, not the CorpusACLMixin.