chore(version): Bump Version to 1.6.1 #817

Job	Run time
test / test-dart-vm (3.0.1)	1m 31s
test / test-dart-vm (stable)	2m 14s
dart2js_test / test-dart-2js (3.0.1, chrome)	5m 35s
dart2js_test / test-dart-2js (3.0.1, firefox)	5m 45s
native_test / test-dart-native (macos-latest)	1m 58s
dart2js_test / test-dart-2js (stable, chrome)	5m 8s
native_test / test-dart-native (windows-latest)	4m 0s
dart2js_test / test-dart-2js (stable, firefox)	5m 28s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 11s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 22s
ddc_test / test-dart-ddc (stable, chrome)	3m 20s
ddc_test / test-dart-ddc (stable, firefox)	2m 24s
	41m 56s

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