fix(smithy): defines Output type to fix beta tests (#3963) #1196

Job	Run time
test / test-dart-vm (3.0.1)	2m 14s
test / test-dart-vm (stable)	3m 14s
test / test-dart-vm (beta)	2m 33s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 25s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 0s
native_test / test-dart-native (macos-latest)	3m 19s
ddc_test / test-dart-ddc (stable, chrome)	2m 18s
native_test / test-dart-native (windows-latest)	2m 40s
dart2js_test / test-dart-2js (3.0.1, chrome)	10m 16s
ddc_test / test-dart-ddc (stable, firefox)	2m 54s
dart2js_test / test-dart-2js (3.0.1, firefox)	9m 46s
ddc_test / test-dart-ddc (beta, chrome)	2m 31s
dart2js_test / test-dart-2js (stable, chrome)	10m 2s
ddc_test / test-dart-ddc (beta, firefox)	2m 52s
dart2js_test / test-dart-2js (stable, firefox)	9m 41s
dart2js_test / test-dart-2js (beta, chrome)	8m 43s
dart2js_test / test-dart-2js (beta, firefox)	9m 18s
	1h 27m 46s

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