feat: update checkout action to v4 #279

Job	Run time
Build and Deploy Docs	0s
Build For watchOS / Build Framework For watchOS Simulator	1m 58s
Build For watchOS / Build Framework For watchOS Device	2m 5s
Build For iOS / Build Framework For iOS Simulator	1m 49s
Build For iOS / Build Framework For iOS Device	1m 38s
Build For macOS / Build Framework For macOS	2m 1s
Build For tvOS / Build Framework For tvOS Device	1m 30s
Build For tvOS / Build Framework For tvOS Simulator	1m 39s
Build For iOS / Build Example For iOS Device	1m 30s
Build For iOS / Build Example For iOS Simulator	3m 54s
Build For watchOS / Build Example For watchOS Simulator	2m 51s
Build For macOS / Build Example For macOS	2m 33s
Build For watchOS / Build Example For watchOS Device	2m 7s
Build For tvOS / Build Example For tvOS Device	1m 46s
Build For tvOS / Build Example For tvOS Simulator	2m 29s
	29m 50s

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