[CI] Stop Xcode 14, start Xcode 15.3 #1897

Job	Run time
spm (iOS, macos-13)	5m 19s
spm (iOS, macos-14)	2m 23s
catalyst	2m 15s
spm (tvOS, macos-13)	4m 3s
spm (tvOS, macos-14)	2m 10s
spm (macOS, macos-13)	2m 54s
mlmodeldownloader-sample-build-test	4m 2s
spm (macOS, macos-14)	1m 46s
spm (catalyst, macos-13)	3m 7s
spm (catalyst, macos-14)	1m 34s
spm (watchOS, macos-13)	5m 3s
pod-lib-lint (ios, macos-14)	6m 55s
spm (watchOS, macos-14)	2m 10s
pod-lib-lint (ios, macos-13)	46m 56s
spm (macos-14, visionOS, Xcode_15.3)	2m 2s
pod-lib-lint (tvos, macos-14)	3m 48s
pod-lib-lint (tvos, macos-13)	7m 1s
pod-lib-lint (macos, macos-14)	3m 22s
pod-lib-lint (macos, macos-13)	7m 8s
pod-lib-lint (watchos, macos-14)	2m 10s
pod-lib-lint (watchos, macos-13)	4m 31s
mlmodeldownloader-cron-only	0s
	2h 0m 39s

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