build(deps): bump actions/checkout from 3 to 4 #496

Job	Run time
linux	2m 39s
linux	2m 39s
spm-test	5m 15s
spm-test	5m 15s
windows	3m 29s
windows	3m 29s
test (platform=iOS\ Simulator,name=iPhone\ 14\ Pro\ Max, test)	10m 33s
test (platform=iOS\ Simulator,name=iPhone\ 14\ Pro\ Max, test)	5m 19s
test (platform\=tvOS\ Simulator,name\=Apple\ TV, test)	10m 8s
test (platform\=tvOS\ Simulator,name\=Apple\ TV, test)	7m 0s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 5\ \(40mm\), build)	2m 36s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 5\ \(40mm\), build)	2m 36s
test (platform=macOS, test)	8m 18s
test (platform=macOS, test)	8m 18s
docs	1m 35s
docs	1m 35s
cocoapods	8m 15s
cocoapods	8m 15s
xcode-test-5_5	1m 29s
xcode-test-5_5	1m 29s
	1h 40m 12s

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