fix: steal maybe

Author: BobTheBuidler

mypyc/primitives/weakref_ops.py

@@ -24,6 +24,7 @@
 new_proxy_op = function_op(
     name="_weakref.proxy",
     arg_types=[object_rprimitive],
+    steals=[True],
     return_type=object_rprimitive,
     c_function_name="PyWeakref_NewProxy",
     extra_int_constants=[(0, pointer_rprimitive)],
@@ -33,6 +34,7 @@
 new_proxy_with_callback_op = function_op(
     name="_weakref.proxy",
     arg_types=[object_rprimitive, object_rprimitive],
+    steals=[True, False],
     return_type=object_rprimitive,
     c_function_name="PyWeakref_NewProxy",
     error_kind=ERR_MAGIC,