xfail refleaking tests due to buggy getattr_static (#125062)

Summary:
For tracking pytorch/pytorch#124302 so that we can re-enable the test once 3.12 updates with the bug fix for python/cpython#118013.

X-link: pytorch/pytorch#125062
Approved by: https://github.com/anijain2305, https://github.com/jansel

Reviewed By: kit1980

Differential Revision: D56801860

Pulled By: williamwen42

fbshipit-source-id: 16b38ce7f1b8cabe2fcdd660fc8a2fabdda04aca

Author: williamwen42

userbenchmark/dynamo/dynamobench/_dynamo/testing.py

@@ -341,6 +341,12 @@ def skipIfNotPy311(fn):
     return unittest.skip(fn)
 
 
+def xfailIfPy312(fn):
+    if sys.version_info >= (3, 12):
+        return unittest.expectedFailure(fn)
+    return fn
+
+
 # Controls tests generated in test/inductor/test_torchinductor_dynamic_shapes.py
 # and test/dynamo/test_dynamic_shapes.py
 def expectedFailureDynamic(fn):