increase On Air connect timeout to 5s

nicegui/air.py

@@ -209,6 +209,7 @@ class Air:
                 f'{RELAY_HOST}?device_token={self.token}',
                 socketio_path='/on_air/socket.io',
                 transports=['websocket', 'polling'],  # favor websocket over polling
+                wait_timeout=5,
             )
             assert self.relay.connected
             return