### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When re-subscribing an SQS queue to an SNS topic with the attribute "RawMessageDelivery=true", localstack throws an error.
It's occuring both on my AWS Java Client and with CLI awslocal
it's working well without this attribute


### Expected Behavior

Since the queue is subscribed with the attribute "RawMessageDelivery=true" to the topic already, it should be a no-op and simply return the same subscription arn.



### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    docker run localstack/localstack

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

```
awslocal sns create-topic --name localstack-topic
awslocal sqs create-queue --queue-name localstack-queue

awslocal sns subscribe   --topic-arn arn:aws:sns:eu-central-1:000000000000:localstack-topic    --protocol sqs    --notification-endpoint arn:aws:sqs:eu-central-1:000000000000:localstack-queue    --return-subscription-arn  --attributes RawMessageDelivery=True

awslocal sns subscribe   --topic-arn arn:aws:sns:eu-central-1:000000000000:localstack-topic    --protocol sqs    --notification-endpoint arn:aws:sqs:eu-central-1:000000000000:localstack-queue    --return-subscription-arn  --attributes RawMessageDelivery=True
```

### Environment

```markdown
aws-cli/1.22.34 Python/3.10.12 Linux/6.2.0-32-generic botocore/1.31.47
```


### Anything else?

subscription created with "RawMessageDelivery=true"

![image](https://github.com/localstack/localstack/assets/98832464/faac719d-b5fe-4920-a756-28abc17fd0e7)


but if the subscription is created without attributes it's working well 

![image](https://github.com/localstack/localstack/assets/98832464/44ed7afd-a3b2-4a19-aff4-cba7b75ad52c)


maybe it's related to https://github.com/localstack/localstack/issues/9058
assert sub_1_attrs["Attributes"]["PendingConfirmation"] == "false"
            # a
            sub_2_attrs = aws_client.sns.get_subscription_attributes(
                SubscriptionArn=sub_2["SubscriptionArn"]
            )
            assert sub_2_attrs["Attributes"]["PendingConfirmation"] == "true"
        finally:
            subscription_list = aws_client.sns.list_subscriptions_by_topic(TopicArn=topic_arn)
            for subscription in subscription_list["Subscriptions"]:
                aws_client.sns.unsubscribe(SubscriptionArn=subscription["SubscriptionArn"])
            for server in servers:
                server.stop()
    @markers.aws.manual_setup_required
    @pytest.mark.parametrize("raw_message_delivery", [True, False])
    def test_subscribe_external_http_endpoint(
        self, sns_create_http_endpoint, raw_message_delivery, aws_client, snapshot
    ):
        def _get_snapshot_requests_response(response: requests.Response) -> dict:
            parsed_xml_body = xmltodict.parse(response.content)
            for root_tag, fields in parsed_xml_body.items():
                fields.pop("@xmlns", None)
                if "ResponseMetadata" in fields:
                    fields["ResponseMetadata"]["HTTPHeaders"] = dict(response.headers)
                    fields["ResponseMetadata"]["HTTPStatusCode"] = response.status_code
            return parsed_xml_body
        snapshot.add_transformer(
            [
                snapshot.transform.key_value("RequestId"),
                snapshot.transform.key_value("Token"),
                snapshot.transform.regex(