ci: Update to Xcode 15.2 (#156) #575

Job	Run time
windows	2m 41s
spm-test	6m 28s
linux	2m 26s
test (platform=iOS\ Simulator,name=iPhone\ 15\ Pro\ Max, test)	14m 22s
test (platform\=tvOS\ Simulator,name\=Apple\ TV, test)	5m 44s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 33s
test (platform=visionOS\ Simulator,name=Apple\ Vision\ Pro, test)	8m 56s
test (platform=macOS, test)	6m 33s
xcode-test-5_5	1m 33s
docs	25s
cocoapods	8m 3s
	58m 44s

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