Fix indent with go fmt (#531)

Co-authored-by: sinozu <sinozu@users.noreply.github.com>

pkg/common/cartesian_test.go

@@ -37,4 +37,3 @@ func TestCartesianProduct(t *testing.T) {
 	output = CartesianProduct(input)
 	assert.Len(output, 0)
 }
-