chore: raise minimum supported platform, Swift, and Xcode versions (#… #1120

Job	Run time
Build Amplify Swift for visionOS / Build Amplify-Build \| visionOS	14m 13s
Build Amplify Swift for tvOS / Build Amplify-Build \| tvOS	10m 36s
Build Amplify Swift for watchOS / Build Amplify-Build \| watchOS	12m 58s
Build Amplify Swift for iOS / Build Amplify-Build \| iOS	18m 9s
Build Amplify Swift for macOS / Build Amplify-Build \| macOS	11m 13s
Confirm Passing Build Steps	3s
	1h 7m 12s

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