Loosen the `file_header` SwiftLint rule #104

Job	Run time
lint	34s
generate-matrices	24s
SPM (Xcode 15.3, Swift 5)	40s
Xcode, macOS (Xcode 15.3, Swift 5)	1m 19s
SPM (Xcode 16-beta, Swift 6)	56s
Example app, macOS (Xcode 15.3, Swift 5)	1m 47s
Xcode, iOS (Xcode 15.3, Swift 5)	2m 6s
Example app, iOS (Xcode 15.3, Swift 5)	1m 44s
Xcode, tvOS (Xcode 15.3, Swift 5)	2m 12s
Example app, tvOS (Xcode 15.3, Swift 5)	1m 38s
Xcode, macOS (Xcode 16-beta, Swift 6)	2m 7s
Example app, macOS (Xcode 16-beta, Swift 6)	1m 53s
Xcode, iOS (Xcode 16-beta, Swift 6)	2m 21s
Example app, iOS (Xcode 16-beta, Swift 6)	1m 22s
Example app, tvOS (Xcode 16-beta, Swift 6)	1m 31s
Xcode, tvOS (Xcode 16-beta, Swift 6)	2m 1s
all-checks-completed	1s
	24m 36s

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