docs: mypy ignore for fictious sample

Author: heitorlessa

Diff for: examples/batch_processing/src/getting_started_dynamodb.py

@@ -18,8 +18,8 @@
 
 @tracer.capture_method
 def record_handler(record: DynamoDBRecord):
-    logger.info(record.dynamodb.new_image)
-    payload: dict = json.loads(record.dynamodb.new_image.get("Message"))
+    logger.info(record.dynamodb.new_image)  # type: ignore[union-attr]
+    payload: dict = json.loads(record.dynamodb.new_image.get("Message"))  # type: ignore[union-attr,arg-type]
     logger.info(payload)
     ...