ci: Enable build of visionOS (#173) #652

Job	Run time
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	9m 10s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	5m 25s
spm-test	4m 1s
linux	2m 30s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 27s
windows	1m 59s
test (platform=macOS, test)	6m 23s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	1m 32s
xcode-test-5_5	1m 10s
cocoapods	7m 26s
docs	1m 3s
	42m 6s

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