Update weakref_ops.py

Author: BobTheBuidler

mypyc/primitives/weakref_ops.py

@@ -24,7 +24,6 @@
 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)],