Fix Color.value deprecation #211

Job	Run time
ensure-codegen	57s
ensure-embedme	9s
code-quality (hive, stable)	53s
check-score (hive)	54s
code-quality (hive, beta)	54s
test-hive (vm, kernel)	54s
check-score (hive_flutter)	38s
code-quality (hive_flutter, stable)	38s
test-hive (chrome, dart2js)	4m 27s
check-score (hive_generator)	53s
test-hive_flutter (stable)	40s
test-hive (chrome, dart2wasm)	2m 49s
code-quality (hive_flutter, beta)	53s
test-hive_flutter (beta)	54s
code-quality (hive_generator, stable)	51s
code-quality (hive_generator, beta)	54s
test-hive_generator (stable, ubuntu-latest)	52s
test-hive_generator (stable, windows-latest)	1m 52s
test-hive_generator (beta, ubuntu-latest)	50s
	21m 52s

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