chore(version): Bump Version to 1.6.1 #1450

Job	Run time
test / test-dart-vm (3.0.1)	1m 44s
test / test-dart-vm (stable)	2m 3s
ddc_test / test-dart-ddc (3.0.1, chrome)	1m 52s
ddc_test / test-dart-ddc (3.0.1, firefox)	1m 57s
native_test / test-dart-native (macos-latest)	2m 8s
dart2js_test / test-dart-2js (3.0.1, chrome)	1m 44s
ddc_test / test-dart-ddc (stable, chrome)	1m 47s
native_test / test-dart-native (windows-latest)	2m 10s
dart2js_test / test-dart-2js (3.0.1, firefox)	1m 56s
ddc_test / test-dart-ddc (stable, firefox)	2m 2s
dart2js_test / test-dart-2js (stable, chrome)	1m 44s
dart2js_test / test-dart-2js (stable, firefox)	1m 58s
	23m 5s

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