test_partitioner_with_spec: accept Python 3.12 setter error message

Differential Revision: D104316540

Pull Request resolved: pytorch#19382

Author: rascani

exir/backend/test/test_partitioner.py

@@ -106,7 +106,7 @@ def partition(
 
         with self.assertRaisesRegex(
             AttributeError,
-            "can't set attribute 'spec'",
+            r"(can't set attribute 'spec'|property 'spec' of .* object has no setter)",
         ):
             my_partitioner.spec = {"new_key": "new_value"}