Handle failing test

Author: slozier

tests/IronPython.Tests/Cases/CPythonCasesManifest.ini

@@ -640,6 +640,9 @@ RunCondition=$(IS_POSIX)
 Ignore=true
 Reason=unittest.case.SkipTest: os.openpty() not available.
 
+[CPython.test_os]
+IsolationLevel=PROCESS # TODO: test_urandom_subprocess fails to import stat otherwise...
+
 [CPython.test_ossaudiodev] # Module has been removed in 3.13 - https://github.com/IronLanguages/ironpython3/issues/1352
 Ignore=true
 Reason=unittest.case.SkipTest: No module named 'ossaudiodev'