Rewrote ObjectChangeMiddleware to remove the curried handle_deleted_object() function

netbox/utilities/querysets.py

@@ -0,0 +1,9 @@
+class DummyQuerySet:
+    """
+    A fake QuerySet that can be used to cache relationships to objects that have been deleted.
+    """
+    def __init__(self, queryset):
+        self._cache = [obj for obj in queryset.all()]
+
+    def all(self):
+        return self._cache