fix(ci): upgrade ´upload-pages-artifact´ to v3 (prerequisite for depl… #243

Job	Run time
flutter-test-analyze / Format	35s
flutter-test-analyze / Analyze	1m 0s
page / deploy	11s
flutter-test-analyze / Test	1m 12s
flutter-build / Android (aab)	6m 0s
flutter-build / iOS	4s
flutter-build / WEB	5s
fastlane-dry-run / Play Store	2m 14s
	11m 21s

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