turbaszek commented on a change in pull request #8575:
URL: https://github.com/apache/airflow/pull/8575#discussion_r479955516



##########
File path: airflow/providers/google/cloud/hooks/cloud_build.py
##########
@@ -55,11 +56,8 @@ class CloudBuildHook(GoogleBaseHook):
     :type impersonation_chain: Union[str, Sequence[str]]
     """
 
-    _conn = None  # type: Optional[Any]
-
     def __init__(
         self,
-        api_version: str = "v1",

Review comment:
       This seems like a not backward-compatible change, can you please add 
information about all such changes in UPDATING.md?




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