chore(version): Bump Version to 1.6.1 #384

Job	Run time
test / test-dart-vm (3.0.1)	1m 48s
test / test-dart-vm (stable)	1m 56s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 5s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 22s
native_test / test-dart-native (macos-latest)	2m 15s
native_test / test-dart-native (windows-latest)	2m 34s
dart2js_test / test-dart-2js (3.0.1, chrome)	4m 29s
ddc_test / test-dart-ddc (stable, chrome)	2m 13s
dart2js_test / test-dart-2js (3.0.1, firefox)	4m 40s
ddc_test / test-dart-ddc (stable, firefox)	3m 29s
dart2js_test / test-dart-2js (stable, chrome)	4m 32s
dart2js_test / test-dart-2js (stable, firefox)	4m 19s
	36m 42s

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