Update CI to Xcode 15.1 #5086

Job	Run time
storage-integration-tests (macos-12, Xcode_14.2)	11m 44s
storage-integration-tests (macos-13, Xcode_15.1)	36m 23s
spm (macos-12, Xcode_14.2)	5m 20s
spm (macos-13, Xcode_15.1)	13m 15s
pod-lib-lint (ios, macos-12)	2m 57s
spm-cron	0s
quickstart (macos-12, Xcode_14.2)	10m 37s
pod-lib-lint (ios, macos-13)	25m 35s
quickstart (macos-13, Xcode_15.1)	26m 25s
pod-lib-lint (tvos, macos-12)	6m 29s
pod-lib-lint (tvos, macos-13)	6m 31s
pod-lib-lint (macos, macos-12)	4m 37s
quickstart-ftl-cron-only	0s
pod-lib-lint (macos, macos-13)	8m 32s
pod-lib-lint (watchos, macos-12)	2m 53s
pod-lib-lint (watchos, macos-13)	6m 1s
storage-cron-only	0s
	2h 47m 19s

Provide feedback