chore(version): Bump Version to 1.6.1 #1250

Job	Run time
test / test-dart-vm (3.0.1)	1m 48s
test / test-dart-vm (stable)	1m 29s
dart2js_test / test-dart-2js (3.0.1, chrome)	4m 6s
dart2js_test / test-dart-2js (3.0.1, firefox)	3m 56s
dart2js_test / test-dart-2js (stable, chrome)	3m 25s
dart2js_test / test-dart-2js (stable, firefox)	3m 36s
native_test / test-dart-native (macos-latest)	2m 44s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 28s
native_test / test-dart-native (windows-latest)	3m 42s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 17s
ddc_test / test-dart-ddc (stable, chrome)	2m 0s
ddc_test / test-dart-ddc (stable, firefox)	2m 18s
	33m 49s

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