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

Job	Run time
pod-lib-lint (ios, macos-14)	4m 4s
pod-lib-lint (ios, macos-13)	7m 6s
pod-lib-lint (tvos, macos-14)	2m 13s
pod-lib-lint (tvos, macos-13)	4m 54s
pod-lib-lint (macos --skip-tests, macos-14)	1m 31s
pod-lib-lint (macos --skip-tests, macos-13)	2m 52s
pod-lib-lint (watchos, macos-14)	1m 20s
pod-lib-lint (watchos, macos-13)	2m 38s
catalyst	1m 49s
spm (iOS, macos-13)	4m 52s
spm (iOS, macos-14)	2m 37s
quickstart	10m 35s
spm (tvOS, macos-13)	4m 36s
spm (tvOS, macos-14)	1m 43s
quickstart-ftl-cron-only	0s
spm (macOS, macos-13)	2m 30s
spm (macOS, macos-14)	1m 40s
spm (catalyst, macos-13)	3m 28s
spm (catalyst, macos-14)	1m 29s
spm (watchOS, macos-13)	4m 16s
spm (watchOS, macos-14)	2m 15s
spm (macos-14, visionOS, Xcode_15.2)	2m 16s
abtesting-cron-only	0s
	1h 10m 44s

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