Update CI to Xcode 15.1 #2175

Job	Run time
catalyst	4m 9s
pod-lib-lint (ios, macos-12)	6m 59s
quickstart	6m 45s
pod-lib-lint (ios, macos-13)	7m 48s
pod-lib-lint (tvos, macos-12)	7m 41s
pod-lib-lint (tvos, macos-13)	5m 33s
quickstart-ftl-cron-only	0s
spm (iOS, macos-12)	5m 47s
pod-lib-lint (macos --skip-tests, macos-12)	2m 57s
pod-lib-lint (macos --skip-tests, macos-13)	4m 19s
spm (iOS, macos-13)	7m 32s
pod-lib-lint (watchos, macos-12)	2m 5s
spm (tvOS, macos-12)	3m 22s
pod-lib-lint (watchos, macos-13)	3m 50s
spm (tvOS, macos-13)	6m 24s
spm (macOS, macos-12)	3m 13s
spm (macOS, macos-13)	4m 6s
spm (catalyst, macos-12)	3m 8s
spm (catalyst, macos-13)	3m 59s
spm (watchOS, macos-12)	3m 18s
spm (watchOS, macos-13)	5m 41s
abtesting-cron-only	0s
	1h 38m 36s

Provide feedback