chore(version): bump version for v2 #1715

Job	Run time
test / test-dart-vm (3.3.0)	1m 38s
test / test-dart-vm (stable)	1m 42s
dart2js_test / test-dart-2js (3.3.0, chrome)	5m 50s
ddc_test / test-dart-ddc (3.3.0, chrome)	4m 18s
native_test / test-dart-native (macos-latest)	1m 24s
ddc_test / test-dart-ddc (3.3.0, firefox)	4m 48s
native_test / test-dart-native (windows-latest)	3m 36s
dart2js_test / test-dart-2js (3.3.0, firefox)	6m 7s
ddc_test / test-dart-ddc (stable, chrome)	4m 23s
dart2js_test / test-dart-2js (stable, chrome)	5m 49s
ddc_test / test-dart-ddc (stable, firefox)	4m 49s
dart2js_test / test-dart-2js (stable, firefox)	5m 57s
	50m 21s

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