samples: updated requierement.txt and enabled list sample test (#48)

Author: munkhuushmgl

datalabeling/snippets/manage_dataset_test.py

@@ -71,7 +71,6 @@ def run_sample():
     assert "The dataset resource name:" in out
 
 
-@pytest.mark.skip("Constantly failing")
 def test_list_dataset(capsys, dataset):
     @backoff.on_exception(
         backoff.expo, ServerError, max_time=testing_lib.RETRY_DEADLINE

datalabeling/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-datalabeling==0.4.0
+google-cloud-datalabeling==1.0.0