### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

I created an SQS FIFO queue with content based deduplication and sent a message that contains the same messageBody and attributes twice.

The message gets sent and received by the queue twice.

Im using the latest version of localstack with docker-compose.


### Expected Behavior

When ContetBasedDeduplication is set to true a message with the same body should only be recieved once by the queue during the 5 minute deduplication interval.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

create queue
```
sqs_client.create_queue(
            QueueName='my_queue.fifo',
            Attributes={
                'FifoQueue': 'true',
                'ContentBasedDeduplication': 'true'
            },
        )
```

send message
```
item = {'hello': 'hola'}
sqs_client.send_message(
            QueueUrl='my_queue.fifo',
            MessageBody=json.dumps(item),
            MessageAttributes= {'hello': {'StringValue': 'hola', 'DataType': 'String'}},
            MessageGroupId='group-1'
        )
```





### Environment

```markdown
- OS:Ubuntu 20.04
- LocalStack: latest
```


### Anything else?

_No response_
self,
        context: RequestContext,
        queue_url: String,
        next_token: Token = None,
        max_results: BoxedInteger = None,
    ) -> ListDeadLetterSourceQueuesResult:
        urls = []
        backend = SqsBackend.get(context.region)
        dead_letter_queue = self._resolve_queue(context, queue_url=queue_url)
        for queue in backend.queues.values():
            policy = queue.attributes.get(QueueAttributeName.RedrivePolicy)
            if policy:
                policy = json.loads(policy)
                dlq_arn = policy.get("deadLetterTargetArn")
                if dlq_arn == dead_letter_queue.arn:
                    urls.append(queue.url(context))
        return ListDeadLetterSourceQueuesResult(queueUrls=urls)
    def delete_message(
        self, context: RequestContext, queue_url: String, receipt_handle: String
    ) -> None:
        queue = self._resolve_queue(context, queue_url=queue_url)
        queue.remove(receipt_handle)
    def delete_message_batch(