Bump dart-lang/setup-dart in the github-actions group (#136) #406

Job	Run time
test (ubuntu-latest, 2.14.4)	31s
test (ubuntu-latest, stable)	22s
test_raw (ubuntu-latest, dev, raw)	13s
test (ubuntu-latest, beta)	23s
test_inferred_channels (2.12.0-29.10.beta)	11s
test (ubuntu-latest, dev)	21s
test_arch	26s
test_raw (ubuntu-latest, main, raw)	12s
test (macos-latest, 2.14.4)	26s
test_raw (macos-latest, dev, raw)	18s
test (macos-latest, stable)	28s
test_raw (macos-latest, main, raw)	14s
test_latest_patch_release (2.19)	17s
test (macos-latest, beta)	27s
test_raw (windows-latest, dev, raw)	22s
test_latest_patch_release (3)	12s
test (macos-latest, dev)	27s
test_latest_patch_release (3.1)	10s
test_raw (windows-latest, main, raw)	18s
test (windows-latest, 2.14.4)	58s
test (windows-latest, stable)	1m 12s
test (windows-latest, beta)	59s
test (windows-latest, dev)	1m 3s
	10m 30s

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