build(deps): bump dart-lang/setup-dart from 1.3.0 to 1.6.0 #1350

Job	Run time
cancel-previous-workflow	4s
android \| ubuntu-latest \| stable	1m 7s
android \| ubuntu-latest \| beta	1m 9s
linux \| ubuntu-latest \| stable	1m 37s
linux \| ubuntu-latest \| beta	1m 21s
windows \| windows-latest \| stable	2m 12s
windows \| windows-latest \| beta	2m 6s
ios \| macos-latest \| stable	2m 2s
macos \| macos-latest \| stable	1m 47s
analyze / analyze	3m 23s
analyze / cancel-previous-workflow	5s
analyze / package-analysis	48s
	17m 41s

Provide feedback