Update CI to Xcode 15.1 #2182

Job	Run time
catalyst	4m 1s
pod-lib-lint (ios, macos-12)	5m 16s
pod-lib-lint (ios, macos-13)	11m 22s
pod-lib-lint (tvos, macos-12)	5m 9s
pod-lib-lint (tvos, macos-13)	6m 55s
spm (iOS, macos-12)	5m 57s
quickstart	8m 56s
spm (iOS, macos-13)	5m 17s
pod-lib-lint (macos --skip-tests, macos-12)	2m 49s
pod-lib-lint (macos --skip-tests, macos-13)	4m 20s
spm (tvOS, macos-12)	6m 29s
pod-lib-lint (watchos, macos-12)	3m 30s
quickstart-ftl-cron-only	0s
spm (tvOS, macos-13)	6m 15s
pod-lib-lint (watchos, macos-13)	3m 36s
spm (macOS, macos-12)	2m 47s
spm (macOS, macos-13)	5m 31s
spm (catalyst, macos-12)	3m 4s
spm (catalyst, macos-13)	5m 12s
spm (watchOS, macos-12)	2m 40s
spm (watchOS, macos-13)	5m 18s
abtesting-cron-only	0s
	1h 44m 24s

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