chore(version): Bump Version to 1.6.1 #1888

Job	Run time
test / test-dart-vm (3.0.1)	7m 23s
test / test-dart-vm (stable)	5m 28s
native_test / test-dart-native (macos-latest)	5m 42s
dart2js_test / test-dart-2js (3.0.1, chrome)	5m 25s
ddc_test / test-dart-ddc (3.0.1, chrome)	4m 16s
native_test / test-dart-native (windows-latest)	7m 49s
dart2js_test / test-dart-2js (3.0.1, firefox)	5m 42s
ddc_test / test-dart-ddc (3.0.1, firefox)	4m 31s
dart2js_test / test-dart-2js (stable, chrome)	5m 16s
ddc_test / test-dart-ddc (stable, chrome)	4m 1s
dart2js_test / test-dart-2js (stable, firefox)	5m 20s
ddc_test / test-dart-ddc (stable, firefox)	4m 21s
	1h 5m 14s

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