In a further sign that iOS 7 will be formally introduced alongside new iPhones at the now-official September 10 Apple media event in Cupertino, the company has updated all three of its iOS “iLife” applications — iPhoto, iMovie and Garageband — to address compatibility issues with the forthcoming update. Compatibility is the main fix listed in the description for all three of the apps, with the Garageband update adding a few bug fixes correcting “minor issues related to general performance and stability.”…