Apple announced today that senior vice president and chief financial officer Peter Oppenheimer will retire at the end of September. Oppenheimer, who has been with Apple since 1996, will be succeeded by Luca Maestri, Apple’s VP of finance and corporate controller. “Peter has served as our CFO for the past decade as Apple’s annual revenue grew from $8 billion to $171 billion and our global footprint expanded dramatically. His guidance, leadership…