chore(deps): update actions/download-artifact to v4 #875

Job	Run time
flutter-test-analyze / Format	37s
flutter-test-analyze / Analyze	1m 7s
flutter-test-analyze / Test	1m 14s
flutter-build / WEB	6s
flutter-build / Android (apk)	6m 0s
flutter-build / iOS	4s
	9m 8s

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