Bug#1024078: pytango FTBFS with Python 3.11 as supported version

[James Addison]

Source: pytango
Followup-For: Bug #1024078

As a maintenance note: it looks like upstream pytango v9.4.0 should resolve this; it includes compatibility[1] with Python 3.11.

That release is currently planned[2] for the end of January, 2023.

[1] - https://gitlab.com/tango-controls/pytango/-/merge_requests/498

[2] - https://gitlab.com/tango-controls/pytango/-/issues/491#note_1193929461