chore(version): Bump version 1.7.0 #1527

Job	Run time
test / test-dart-vm (3.0.1)	1m 46s
test / test-dart-vm (stable)	1m 46s
native_test / test-dart-native (macos-latest)	3m 13s
native_test / test-dart-native (windows-latest)	3m 41s
dart2js_test / test-dart-2js (3.0.1, chrome)	18m 22s
dart2js_test / test-dart-2js (3.0.1, firefox)	19m 15s
ddc_test / test-dart-ddc (3.0.1, chrome)	10m 56s
ddc_test / test-dart-ddc (3.0.1, firefox)	11m 9s
dart2js_test / test-dart-2js (stable, chrome)	16m 55s
ddc_test / test-dart-ddc (stable, chrome)	9m 30s
dart2js_test / test-dart-2js (stable, firefox)	16m 56s
ddc_test / test-dart-ddc (stable, firefox)	10m 2s
	2h 3m 31s

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