Fix race condition in FileStorageKey #6078

Job	Run time
Check Macro Compatibility	5m 2s
Examples	39m 11s
xcodebuild (test, IOS, 15.4)	4m 42s
xcodebuild (test, IOS, 16.0)	4m 56s
Library (evolution)	3m 58s
xcodebuild (test, MAC_CATALYST, 15.4)	3m 9s
xcodebuild (test, MACOS, 15.4)	3m 8s
xcodebuild (test, MACOS, 16.0)	1s
xcodebuild (test, TVOS, 15.4)	1s
xcodebuild (test, VISIONOS, 15.4)	1s
xcodebuild (test, WATCHOS, 15.4)	1s
xcodebuild (IOS, 15.2)	7m 12s
xcodebuild (MACOS, 15.2)	5m 39s
	1h 17m 1s

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