Audi’s V-10 engine is not long for this world. The brand with the four rings in its logo on Monday unveiled the R8 V10 GT RWD, and confirmed the car as the swan song for the V-10. It starts sales in 2023 and in Europe will carry a price tag of 225,000 euros (approximately $220,460). Pricing for the U.S. hasn’t been announced. Just 333 examples of…