chore(version): Bump Version to 1.6.1 #1237

Job	Run time
test / test-dart-vm (3.0.1)	2m 6s
test / test-dart-vm (stable)	2m 13s
ddc_test / test-dart-ddc (3.0.1, chrome)	1m 52s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 5s
ddc_test / test-dart-ddc (stable, chrome)	1m 51s
ddc_test / test-dart-ddc (stable, firefox)	2m 6s
native_test / test-dart-native (macos-latest)	1m 59s
native_test / test-dart-native (windows-latest)	2m 7s
dart2js_test / test-dart-2js (3.0.1, chrome)	3m 13s
dart2js_test / test-dart-2js (3.0.1, firefox)	1m 57s
dart2js_test / test-dart-2js (stable, chrome)	1m 45s
dart2js_test / test-dart-2js (stable, firefox)	1m 55s
	25m 9s

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