Formula 1 will have a full-time Brazilian driver for the first time since 2017 after Sauber announced 20-year-old Gabriel Bortoleto to complete the future Audi team's line-up for 2025 and 2026. The Swiss-based team earlier announced the departure of Finland's Valtteri Bottas and Zhou Guanyu, China's first F1 driver, at the end of the season in December. "Joining a team …