[CI] Stop Xcode 14, start Xcode 15.3 #2327

Job	Run time
catalyst	2m 4s
quickstart	18m 3s
pod-lib-lint (ios, macos-14)	10m 15s
pod-lib-lint (ios, macos-13)	2m 44s
pod-lib-lint (tvos, macos-14)	2m 36s
quickstart-ftl-cron-only	0s
pod-lib-lint (tvos, macos-13)	2m 36s
spm (iOS, macos-13)	1m 49s
pod-lib-lint (macos --skip-tests, macos-14)	1m 37s
spm (iOS, macos-14)	1m 10s
pod-lib-lint (macos --skip-tests, macos-13)	4m 9s
spm (tvOS, macos-13)	2m 8s
pod-lib-lint (watchos, macos-14)	1m 22s
spm (tvOS, macos-14)	1m 9s
pod-lib-lint (watchos, macos-13)	2m 49s
spm (macOS, macos-13)	3m 5s
spm (macOS, macos-14)	1m 16s
spm (watchOS, macos-13)	2m 19s
spm (watchOS, macos-14)	1m 28s
spm (catalyst, macos-13)	2m 16s
spm (catalyst, macos-14)	1m 16s
spm (macos-14, visionOS, Xcode_15.3)	1m 44s
installations-cron-only	0s
	1h 7m 55s

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