Update CI to Xcode 15.1 #2181

Job	Run time
catalyst	3m 7s
pod-lib-lint (ios, macos-12)	4m 57s
pod-lib-lint (ios, macos-13)	9m 12s
quickstart	7m 51s
pod-lib-lint (tvos, macos-12)	5m 8s
quickstart-ftl-cron-only	0s
pod-lib-lint (tvos, macos-13)	4m 50s
spm (iOS, macos-12)	5m 17s
pod-lib-lint (macos --skip-tests, macos-12)	2m 53s
spm (iOS, macos-13)	7m 13s
pod-lib-lint (macos --skip-tests, macos-13)	4m 56s
spm (tvOS, macos-12)	5m 8s
pod-lib-lint (watchos, macos-12)	3m 3s
spm (tvOS, macos-13)	4m 9s
pod-lib-lint (watchos, macos-13)	4m 8s
spm (macOS, macos-12)	2m 34s
spm (macOS, macos-13)	4m 13s
spm (catalyst, macos-12)	2m 6s
spm (catalyst, macos-13)	3m 39s
spm (watchOS, macos-12)	4m 27s
spm (watchOS, macos-13)	5m 1s
abtesting-cron-only	0s
	1h 33m 52s

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