By Bhanvi Satija and Yadarisa Shabong LONDON (Reuters) -GSK raised its 2025 sales and earnings forecasts on Wednesday as its speciality HIV and cancer drugs posted double digit growth, lifting the British company's shares by nearly 7% to their highest level since May 2024. GSK's improved outlook comes as CEO Emma Walmsley prepares to hand over to Luke Miels early next year, with the drugmaker navigating U.S. tariffs and seeking new medicines to offset revenue declines as some top-selling drugs go off pat ...