AttributeError: 'tzfile' object has no attribute 'key'
Tools timezone.py is using a fallback because zoneinfo is available for python 3.9 (https://foss.heptapod.net/tryton/tryton/-/blob/branch/default/trytond/trytond/tools/timezone.py#L13). But gettz as ZoneInfo in dateutil.tz has no attribute 'key'.