[CI] Stop Xcode 14, start Xcode 15.3 #2320

Job	Run time
pod-lib-lint (ios, macos-14)	5m 32s
pod-lib-lint (ios, macos-13)	8m 43s
spm (iOS, macos-13)	5m 40s
pod-lib-lint (tvos, macos-14)	1m 57s
spm (iOS, macos-14)	3m 44s
catalyst	1m 58s
pod-lib-lint (tvos, macos-13)	4m 44s
spm (tvOS, macos-13)	3m 48s
pod-lib-lint (macos --skip-tests, macos-14)	1m 41s
quickstart	16m 50s
spm (tvOS, macos-14)	1m 45s
pod-lib-lint (macos --skip-tests, macos-13)	3m 6s
spm (macOS, macos-13)	3m 18s
pod-lib-lint (watchos, macos-14)	1m 50s
quickstart-ftl-cron-only	0s
spm (macOS, macos-14)	1m 40s
spm (catalyst, macos-13)	2m 55s
spm (catalyst, macos-14)	1m 36s
pod-lib-lint (watchos, macos-13)	3m 24s
spm (watchOS, macos-13)	3m 42s
spm (watchOS, macos-14)	2m 19s
spm (macos-14, visionOS, Xcode_15.2)	2m 13s
abtesting-cron-only	0s
	1h 22m 25s

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