Set dart runtime version with parsed `Platform.version` #2247

Job	Run time
cancel-previous-workflow	2s
android \| ubuntu-latest \| stable	1m 7s
android \| ubuntu-latest \| beta	1m 3s
linux \| ubuntu-latest \| stable	1m 34s
linux \| ubuntu-latest \| beta	1m 27s
windows \| windows-latest \| stable	2m 19s
ios \| macos-latest \| stable	1m 9s
macos \| macos-latest \| stable	1m 44s
analyze / cancel-previous-workflow	2s
analyze / analyze	1m 43s
analyze / package-analysis	1m 59s
	14m 9s

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