Update CI to Xcode 15.1 #2179

Job	Run time
pod-lib-lint (ios, macos-12)	1m 30s
pod-lib-lint (ios, macos-13)	1m 31s
pod-lib-lint (tvos, macos-12)	1m 29s
spm (iOS, macos-12)	1m 4s
spm (iOS, macos-13)	58s
pod-lib-lint (tvos, macos-13)	1m 25s
spm (tvOS, macos-12)	51s
pod-lib-lint (macos --skip-tests, macos-12)	1m 24s
spm (tvOS, macos-13)	49s
pod-lib-lint (macos --skip-tests, macos-13)	1m 29s
spm (macOS, macos-12)	54s
pod-lib-lint (watchos, macos-12)	1m 13s
spm (macOS, macos-13)	54s
pod-lib-lint (watchos, macos-13)	1m 15s
spm (catalyst, macos-12)	42s
spm (catalyst, macos-13)	1m 8s
spm (watchOS, macos-12)	45s
catalyst	1m 9s
spm (watchOS, macos-13)	49s
quickstart	1m 11s
quickstart-ftl-cron-only	0s
abtesting-cron-only	1s
	22m 31s

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