Update Package.swift to avoid deprectiation warning.

[Fahrenberg]

Updated Xcode to v 26, Package for iOS minimum version 'v9' is deprecated: iOS 12.0 is the oldest supported version by Apple. Please update the Swift Manifest to work with iOS12 (or later) to iOS 26.

Please check dependencies: dependencies: [ .package(url: "https://github.com/Quick/Quick", .exact("3.1.2")), .package(url: "https://github.com/Quick/Nimble", .exact("9.2.1")), ],

Are they needed to be exact?

[KMessina1]

Same here. Upgrading to Xcode 16 gives these warnings.