chore(version): Bump version 1.7.0 #1192

Job	Run time
test / test-dart-vm (3.0.1)	1m 42s
test / test-dart-vm (stable)	1m 44s
native_test / test-dart-native (macos-latest)	2m 40s
native_test / test-dart-native (windows-latest)	2m 58s
ddc_test / test-dart-ddc (3.0.1, chrome)	3m 3s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 22s
ddc_test / test-dart-ddc (stable, chrome)	2m 59s
ddc_test / test-dart-ddc (stable, firefox)	3m 11s
dart2js_test / test-dart-2js (3.0.1, chrome)	3m 40s
dart2js_test / test-dart-2js (3.0.1, firefox)	3m 48s
dart2js_test / test-dart-2js (stable, chrome)	3m 26s
dart2js_test / test-dart-2js (stable, firefox)	3m 38s
	36m 11s

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