By Jack NicasPhotographs and Video by Victor Moriyama Jack Nicas, The Times’s Brazil correspondent, traveled 100 miles along the Itaquaí River deep in the Amazon rainforest to retrace the men’s final trip. July 11, 2022 Leer en español ITAQUAÍ RIVER, Brazil — It was 4 a.m., the sun had yet to rise over the Itaquaí…