Make sure UUID is in trackers in Responder::get_outdated_trackers

[sr-gi]

https://github.com/talaia-labs/python-teos/blob/66bc075d2432c45691af77cde20cbecd46341107/teos/responder.py#L451-L452

get_outdated_trackers source comes from Gatekeeper::get_outdated_appointments, which can return data that is either in the Watcher or the Responder. Data should be intersected with Responder::trackers to make sure the map is not accessed for missing items.