Callum Turner has been cast in George Clooney’s ‘The Boys in the Boat’. The 31-year-old actor has been tapped by the Oscar-winner to star in his new movie, which he is directing with Grant Heslov. The film is based on Daniel James Brown’s 2013 novel ‘The Boys in the Boat: Nine Americans and their Epic Quest for Gold at the 1936 Berlin Olympics’ and will tell the story of how the University of Washington’s men’s rowing team – who stunned the world by winning gold at the 1936 Berlin Olympics. Mark L. Smith is adapting the screenplay with Chris Weitz penning a previous draft of the script. George…