Fix format warning in Tuya component (#1954)

esphome/components/tuya/tuya.cpp

@@ -297,7 +297,7 @@ void Tuya::handle_datapoint_(const uint8_t *buffer, size_t len) {
       ESP_LOGD(TAG, "Datapoint %u update to %#08X", datapoint.id, datapoint.value_bitmask);
       break;
     default:
-      ESP_LOGW(TAG, "Datapoint %u has unknown type %#02hhX", datapoint.id, datapoint.type);
+      ESP_LOGW(TAG, "Datapoint %u has unknown type %#02hhX", datapoint.id, static_cast<uint8_t>(datapoint.type));
       return;
   }