Cillian Murphy is “excited” about his first role after ‘Oppenheimer’. The 48-year-old actor enjoyed Oscar-winning success as the titular wartime hero in the 2023 drama and as he gears up to both star and produce in ‘Small Things Like These’ – which follows an Irish coal merchant in the 1980s who discovers secrets about his life – and is “not nervous” because the fate of a film is never sealed until after it is released. He told Collider: ” I’m not nervous, I’m excited. A film isn’t finished until the audience sees it. So I’m very, very invested in what the Irish people think. And the book is s…