Update CI to Xcode 15.1 #5090

Job	Run time
storage-integration-tests (macos-12, Xcode_14.2)	8m 7s
spm (macos-12, Xcode_14.2)	5m 44s
storage-integration-tests (macos-13, Xcode_15.1)	29m 43s
spm (macos-13, Xcode_15.1)	13m 55s
pod-lib-lint (ios, macos-12)	3m 7s
quickstart (macos-12, Xcode_14.2)	9m 44s
pod-lib-lint (ios, macos-13)	9m 28s
spm-cron	0s
quickstart (macos-13, Xcode_15.1)	13m 53s
pod-lib-lint (tvos, macos-12)	2m 32s
pod-lib-lint (tvos, macos-13)	8m 30s
pod-lib-lint (macos, macos-12)	3m 39s
quickstart-ftl-cron-only	0s
pod-lib-lint (macos, macos-13)	6m 1s
pod-lib-lint (watchos, macos-12)	3m 11s
pod-lib-lint (watchos, macos-13)	4m 53s
storage-cron-only	0s
	2h 2m 27s

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