chore(version): Bump Version to 1.6.1 #1345

Job	Run time
test / test-dart-vm (3.0.1)	2m 40s
test / test-dart-vm (stable)	2m 33s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 42s
ddc_test / test-dart-ddc (3.0.1, firefox)	2m 38s
ddc_test / test-dart-ddc (stable, chrome)	2m 19s
dart2js_test / test-dart-2js (3.0.1, chrome)	3m 16s
native_test / test-dart-native (macos-latest)	2m 40s
ddc_test / test-dart-ddc (stable, firefox)	2m 45s
dart2js_test / test-dart-2js (3.0.1, firefox)	3m 18s
native_test / test-dart-native (windows-latest)	3m 27s
dart2js_test / test-dart-2js (stable, chrome)	2m 58s
dart2js_test / test-dart-2js (stable, firefox)	3m 14s
	34m 30s

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