chore(version): bump version for v2 #1431

Job	Run time
test / test-dart-vm (3.3.0)	1m 37s
test / test-dart-vm (stable)	1m 32s
dart2js_test / test-dart-2js (3.3.0, chrome)	3m 49s
ddc_test / test-dart-ddc (3.3.0, chrome)	3m 5s
ddc_test / test-dart-ddc (3.3.0, firefox)	3m 4s
ddc_test / test-dart-ddc (stable, chrome)	3m 28s
dart2js_test / test-dart-2js (3.3.0, firefox)	3m 37s
ddc_test / test-dart-ddc (stable, firefox)	3m 8s
native_test / test-dart-native (macos-latest)	1m 4s
dart2js_test / test-dart-2js (stable, chrome)	3m 25s
native_test / test-dart-native (windows-latest)	3m 17s
dart2js_test / test-dart-2js (stable, firefox)	3m 47s
	34m 53s

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