Update weakref_ops.py

Author: BobTheBuidler

mypyc/primitives/weakref_ops.py

@@ -6,13 +6,13 @@
 py_weakref_new_ref_op = function_op(
     name="weakref.weakref",
     arg_types=[object_rprimitive, object_rprimitive],
-    result_type=object_rprimitive,
+    return_type=object_rprimitive,
     c_function_name="PyWeakref_NewRef",
 )
 
 py_weakref_new_ref_op = function_op(
     name="weakref.proxy",
     arg_types=[object_rprimitive, object_rprimitive],
-    result_type=object_rprimitive,
+    return_type=object_rprimitive,
     c_function_name="PyWeakref_NewProxy",
 )