Change EnvelopeItem dataFactory to FutureOr #1416

Job	Run time
android \| ubuntu-latest \| stable	1m 8s
cancel-previous-workflow	2s
android \| ubuntu-latest \| beta	1m 1s
linux \| ubuntu-latest \| stable	1m 29s
linux \| ubuntu-latest \| beta	1m 27s
ios \| macos-latest \| stable	1m 17s
macos \| macos-latest \| stable	1m 38s
windows \| windows-latest \| stable	2m 45s
analyze / cancel-previous-workflow	2s
analyze / analyze	1m 25s
analyze / package-analysis	1m 37s
	13m 51s

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