chore(version): Bump Version to 1.6.1 #1824

Job	Run time
test / test-dart-vm (3.0.1)	3m 49s
test / test-dart-vm (stable)	2m 14s
native_test / test-dart-native (macos-latest)	4m 23s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 59s
native_test / test-dart-native (windows-latest)	3m 55s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 21s
ddc_test / test-dart-ddc (stable, chrome)	2m 49s
dart2js_test / test-dart-2js (3.0.1, chrome)	3m 31s
dart2js_test / test-dart-2js (3.0.1, firefox)	3m 44s
ddc_test / test-dart-ddc (stable, firefox)	3m 58s
dart2js_test / test-dart-2js (stable, chrome)	3m 17s
dart2js_test / test-dart-2js (stable, firefox)	3m 35s
	41m 35s

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