chore(version): Bump Version to 1.6.1 #1252

Job	Run time
test / test-dart-vm (3.0.1)	2m 29s
test / test-dart-vm (stable)	2m 19s
dart2js_test / test-dart-2js (3.0.1, chrome)	9m 5s
dart2js_test / test-dart-2js (3.0.1, firefox)	9m 58s
dart2js_test / test-dart-2js (stable, chrome)	8m 36s
native_test / test-dart-native (macos-latest)	3m 16s
dart2js_test / test-dart-2js (stable, firefox)	9m 2s
native_test / test-dart-native (windows-latest)	3m 42s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 26s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 13s
ddc_test / test-dart-ddc (stable, chrome)	2m 22s
ddc_test / test-dart-ddc (stable, firefox)	2m 57s
	59m 25s

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