chore(version): Bump Version to 1.6.1 #1332

Job	Run time
test / test-dart-vm (3.0.1)	2m 3s
test / test-dart-vm (stable)	2m 10s
native_test / test-dart-native (macos-latest)	1m 57s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 21s
native_test / test-dart-native (windows-latest)	4m 8s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 41s
ddc_test / test-dart-ddc (stable, chrome)	2m 19s
ddc_test / test-dart-ddc (stable, firefox)	2m 36s
dart2js_test / test-dart-2js (3.0.1, chrome)	3m 47s
dart2js_test / test-dart-2js (3.0.1, firefox)	4m 12s
dart2js_test / test-dart-2js (stable, chrome)	3m 52s
dart2js_test / test-dart-2js (stable, firefox)	4m 4s
	36m 10s

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