Don't need to inherit from object anymore

jedi/inference/gradual/generics.py

@@ -23,7 +23,7 @@ def _resolve_forward_references(context, value_set):
             yield value
 
 
-class _AbstractGenericManager(object):
+class _AbstractGenericManager:
     def get_index_and_execute(self, index):
         try:
             return self[index].execute_annotation()