Update aws_lambda_powertools/utilities/data_classes/kinesis_stream_event.py

Co-authored-by: Leandro Damascena <[email protected]>
Signed-off-by: kiitosu <[email protected]>

Author: kiitosu

aws_lambda_powertools/utilities/data_classes/kinesis_stream_event.py

@@ -140,7 +140,7 @@ def shard_id(self) -> str | None:
 
     @property
     def event_source_arn(self) -> str | None:
-        return self["eventSourceARN"]
+        return self.get("eventSourceARN")
 
     @property
     def is_final_invoke_for_window(self) -> bool: