on_sqs_message missing parameter for MaximumBatchingWindowInSeconds

This prevents us from using batch sizes > 10, since deploy fails with
botocore.errorfactory.InvalidParameterValueException: An error occurred (InvalidParameterValueException) when calling the CreateEventSourceMapping operation: Maximum batch window in seconds must be greater than 0 if maximum batch size is greater than 10

Start by tracing the on_sqs_message configuration to the CreateEventSourceMapping call, then check how batch size is passed for SQS event sources. Verify the requested MaximumBatchingWindowInSeconds value is accepted when the maximum batch size exceeds 10, and confirm deployment succeeds without the InvalidParameterValueException.

Written by the indexing model from the issue text.