chore(deps): update actions/upload-artifact to v4 #876

Job	Run time
flutter-test-analyze / Analyze	1m 6s
flutter-test-analyze / Test	1m 11s
flutter-test-analyze / Format	35s
flutter-build / iOS	5s
flutter-build / Android (apk)	7m 49s
flutter-build / WEB	4s
	10m 50s

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