feat: Remove support for Xcode 14 #666

Job	Run time
docs	1m 29s
docs	1m 29s
tests (test:ios)	1m 26s
tests (test:ios)	1m 26s
Xcode 15	1s
Xcode 15	1s
tests (test:macos)	1m 28s
tests (test:macos)	1m 28s
Xcode 16	1s
Xcode 16	1s
tests (test:parse_live_query:all)	1m 9s
tests (test:parse_live_query:all)	1m 9s
iOS 17, iPhone 16	1s
iOS 17, iPhone 16	1m 34s
tests (xcode15)	1m 28s
tests (xcode15)	1m 28s
iOS 18, iPhone 16	1s
iOS 18, iPhone 16	1s
tests (xcode16)	1s
tests (xcode16)	1s
macOS 14	1s
macOS 14	1s
	15m 45s

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