[PATCH] gdb/testsuite: fix gdb.python/py-unwind.exp with python >= 3.11

[Tom Tromey]

>>>>> "Ilya" == Ilya Leoshkevich via Gdb-patches <gdb-patches@sourceware.org> writes:

Ilya> Python 3.11 changed the AttributeError message - see commit
Ilya> 0cb765b2cec9 ("bpo-46730: Add more info to @property AttributeError
Ilya> messages (GH-31311)").  Add the new message to the expectations.

Thank you, this is ok.
Approved-By: Tom Tromey <tom@tromey.com>


Tom