feat(src/tickets): assign request user as ticket updater

Ensure audit trail of status changes by recording requesting user.

src/tickets/views.py

@@ -120,6 +120,7 @@ def move_ticket_view(request, pk):
                 )
 
             old_status_id = ticket.status_id
+            ticket._updater = request.user
             ticket.status_id = new_status_id
             ticket.save()
             if old_status_id != int(new_status_id):