build(deps): bump compnerd/gha-setup-swift from 0.3.0 to 0.4.0 #1234

Job	Run time
spm-test	3m 59s
windows	8m 56s
linux	1m 46s
android	1m 34s
test (platform\=tvOS\ Simulator,name\=Apple\ TV, test)	5m 21s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 11\ \(46mm\), build)	1m 36s
test (platform=visionOS\ Simulator,OS=26.2,name=Apple\ Vision\ Pro, test)	7m 49s
test (platform=macOS, test)	5m 24s
test (platform=iOS\ Simulator,name=iPhone\ 17\ Pro\ Max, test)	6m 57s
cocoapods	4m 2s
docs	37s
spm-test-oldest	5m 22s
	53m 23s

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