Bump dart-lang/setup-dart from 1.6.0 to 1.6.2 #238

Job	Run time
test_dart (ubuntu-latest, 3.0.0)	1m 57s
analyze (dev)	16s
test_dart (ubuntu-latest, dev)	1m 30s
test_flutter (ubuntu-latest, beta)	2m 12s
test_dart (macos-latest, 3.0.0)	3m 58s
test_flutter (ubuntu-latest, stable)	2m 9s
test_dart (macos-latest, dev)	3m 21s
test_flutter (macos-latest, beta)	4m 45s
test_dart (windows-latest, 3.0.0)	2m 20s
test_flutter (macos-latest, stable)	3m 36s
test_dart (windows-latest, dev)	2m 1s
test_flutter (windows-latest, beta)	3m 57s
test_flutter (windows-latest, stable)	3m 40s
	35m 42s

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