chore(deps): update dependency backoff to v2 (#386)

* chore(deps): update dependency backoff to v2

* test: backoff wait_gen arg expects a generator

Co-authored-by: Anthonios Partheniou <[email protected]>

Author: 2 people

translation/samples/snippets/requirements-test.txt

@@ -1,3 +1,3 @@
-backoff==1.11.1
+backoff==2.0.0
 flaky==3.7.0
 pytest==7.1.2

translation/samples/snippets/translate_v3_batch_translate_text_with_glossary_test.py

@@ -45,22 +45,28 @@ def bucket():
 
 def on_backoff(invocation_dict):
     """Backoff callback; create a testing bucket for each backoff run"""
-    invocation_dict['kwargs']['bucket'] = next(get_ephemeral_bucket())
+    invocation_dict["kwargs"]["bucket"] = next(get_ephemeral_bucket())
 
 
 # If necessary, retry test function while backing off the timeout sequentially
 MAX_TIMEOUT = 500
 
 
-@backoff.on_exception(wait_gen=lambda : iter([100, 250, 300, MAX_TIMEOUT]), exception=Exception, max_tries=5, on_backoff=on_backoff)
+@backoff.on_exception(
+    wait_gen=lambda: (wait_time for wait_time in [100, 250, 300, MAX_TIMEOUT]),
+    exception=Exception,
+    max_tries=5,
+    on_backoff=on_backoff,
+)
 def test_batch_translate_text_with_glossary(capsys, bucket):
 
     translate_v3_batch_translate_text_with_glossary.batch_translate_text_with_glossary(
         "gs://cloud-samples-data/translation/text_with_glossary.txt",
         "gs://{}/translation/BATCH_TRANSLATION_GLOS_OUTPUT/".format(bucket.name),
         PROJECT_ID,
         GLOSSARY_ID,
-        MAX_TIMEOUT)
+        MAX_TIMEOUT,
+    )
 
     out, _ = capsys.readouterr()
     assert "Total Characters: 9" in out