chore(version): Bump Version to 1.6.1 #1234

Job	Run time
test / test-dart-vm (3.0.1)	2m 16s
test / test-dart-vm (stable)	2m 12s
ddc_test / test-dart-ddc (3.0.1, chrome)	1m 50s
ddc_test / test-dart-ddc (3.0.1, firefox)	1m 56s
native_test / test-dart-native (macos-latest)	2m 7s
ddc_test / test-dart-ddc (stable, chrome)	1m 43s
native_test / test-dart-native (windows-latest)	3m 7s
ddc_test / test-dart-ddc (stable, firefox)	1m 52s
dart2js_test / test-dart-2js (3.0.1, chrome)	1m 53s
dart2js_test / test-dart-2js (3.0.1, firefox)	1m 59s
dart2js_test / test-dart-2js (stable, chrome)	1m 42s
dart2js_test / test-dart-2js (stable, firefox)	1m 52s
	24m 29s

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