ci: use Xcode 16.0 #347

Job	Run time
swiftpm (iphoneos, arm64)	4s
build (5, 16.0, macos-14)	46s
swiftpm (iphonesimulator, x86_64)	23s
cocoapods	1m 27s
build (5.10, 15.4, macos-14)	49s
swiftpm (iphonesimulator, arm64)	20s
example (Maps)	1m 9s
build (5.9, 15.2, macos-13)	43s
example (Maps-SwiftUI)	54s
build (5.8, 14.3.1, macos-13)	40s
example (Stocks)	1m 15s
swiftpm_old (x86_64-apple-ios16.4-simulator, 14.3.1, macos-13)	1m 8s
build (5.7, 14.1, macos-12)	34s
example (Samples)	1m 10s
test (18.0, 16.0, iPhone 16 Pro, NO, macos-14)	4m 32s
swiftpm_old (arm64-apple-ios16.4-simulator, 14.3.1, macos-13)	35s
build (5.6, 13.4.1, macos-12)	35s
test (17.5, 15.4, iPhone 15 Pro, NO, macos-14)	2m 30s
build (5.5, 13.2.1, macos-12)	1m 39s
swiftpm_old (x86_64-apple-ios15.7-simulator, 14.1, macos-12)	37s
test (16.4, 14.3.1, iPhone 14 Pro, NO, macos-13)	3m 26s
swiftpm_old (arm64-apple-ios15.7-simulator, 14.1, macos-12)	39s
test (15.5, 13.4.1, iPhone 13 Pro, NO, macos-12)	2m 58s
	28m 53s

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