chore(version): Bump version 1.7.0 #1530

Job	Run time
test / test-dart-vm (3.0.1)	1m 46s
test / test-dart-vm (stable)	1m 48s
dart2js_test / test-dart-2js (3.0.1, chrome)	19m 30s
ddc_test / test-dart-ddc (3.0.1, chrome)	11m 35s
dart2js_test / test-dart-2js (3.0.1, firefox)	19m 17s
ddc_test / test-dart-ddc (3.0.1, firefox)	12m 4s
dart2js_test / test-dart-2js (stable, chrome)	16m 54s
ddc_test / test-dart-ddc (stable, chrome)	9m 39s
dart2js_test / test-dart-2js (stable, firefox)	16m 26s
ddc_test / test-dart-ddc (stable, firefox)	9m 58s
native_test / test-dart-native (macos-latest)	2m 40s
native_test / test-dart-native (windows-latest)	3m 23s
	2h 5m 0s

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