Set dart runtime version with parsed `Platform.version` #7221

Job	Run time
cancel-previous-workflow	4s
android \| ubuntu \| stable	4m 30s
android \| ubuntu \| beta	4m 51s
ios \| macos \| stable	6m 8s
ios \| macos \| beta	4m 7s
macos \| macos \| stable	7m 41s
macos \| macos \| beta	12m 34s
linux \| ubuntu \| stable	4m 26s
linux \| ubuntu \| beta	4m 14s
windows \| windows \| stable	5m 13s
web \| ubuntu \| stable	5m 38s
web \| ubuntu \| beta	5m 26s
pod-lint	3m 31s
swift-lint	28s
detekt	11s
ktlint	25s
analyze / cancel-previous-workflow	2s
analyze / analyze	2m 21s
analyze / package-analysis	2m 37s
	1h 14m 27s

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