### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

I am running an SNS topic that publishes to a lambda function. The localstack code reads a type byte object from the lambda function invocation payload [here](https://github.com/localstack/localstack/blob/master/localstack/services/sns/publisher.py#L187) and then tries to dump the result into json [here](https://github.com/localstack/localstack/blob/master/localstack/services/sns/publisher.py#L863) which results in the following error:
```
sns_pub_0] l.services.sns.publisher   : Unable to run Lambda function on SNS message: Object of type bytes is not JSON serializable
```

### Expected Behavior

The payload bytes should be converted to a string before being dumped to json. The error should not be thrown.

### 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-compose up
(Using the standard docker-compose.yaml)

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

```
awslocal sns publish --message file://sns/message.json --topic-arn arn:aws:sns:us-east-1:000000000000:<topic_name>
```

### Environment

```markdown
- OS: macOS Ventura 13.2.1
- LocalStack: latest
```


### Anything else?

_No response_
if sqs_system_attrs:
                entry["MessageSystemAttributes"] = sqs_system_attrs
            entries.append(entry)
        try:
            queue_url = sqs_queue_url_for_arn(subscriber["Endpoint"])
            parsed_arn = parse_arn(subscriber["Endpoint"])
            sqs_client = aws_stack.connect_to_service("sqs", region_name=parsed_arn["region"])
            response = sqs_client.send_message_batch(QueueUrl=queue_url, Entries=entries)
            for message_ctx in context.messages:
                store_delivery_log(message_ctx, subscriber, success=True)
            if failed_messages := response.get("Failed"):
                for failed_msg in failed_messages:
                    failure_data = failure_map.get(failed_msg["Id"])
                    LOG.info(
                        "Unable to forward SNS message to SQS: %s %s",
                        failed_msg["Code"],
                        failed_msg["Message"],
                    )
                    store_delivery_log(failure_data["context"], subscriber, success=False)
                    sns_error_to_dead_letter_queue(
                        sns_subscriber=subscriber,
                        message=failure_data["entry"]["MessageBody"],
                        error=failed_msg["Code"],
                        msg_attrs=failure_data["entry"]["MessageAttributes"],
                    )
        except Exception as exc:
            LOG.info("Unable to forward SNS message to SQS: %s %s", exc, traceback.format_exc())
            for msg_context in context.messages:
                store_delivery_log(msg_context, subscriber, success=False)
                msg_body = self.prepare_message(msg_context, subscriber)