### 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_
return subscriber.get("RawMessageDelivery") in ("true", True, "True")
def store_delivery_log(
    message_context: SnsMessage, subscriber: SnsSubscription, success: bool, delivery: dict = None
):
    """Store the delivery logs in CloudWatch"""
    log_group_name = subscriber.get("TopicArn", "").replace("arn:aws:", "").replace(":", "/")
    log_stream_name = long_uid()
    invocation_time = int(time.time() * 1000)
    delivery = not_none_or(delivery, {})
    delivery["deliveryId"] = (long_uid(),)
    delivery["destination"] = (subscriber.get("Endpoint", ""),)
    delivery["dwellTimeMs"] = 200
    if not success:
        delivery["attemps"] = 1
    if (protocol := subscriber["Protocol"]) == "application":
        protocol = get_platform_type_from_endpoint_arn(subscriber["Endpoint"])
    message = message_context.message_content(protocol)
    delivery_log = {
        "notification": {
            "messageMD5Sum": md5(message),
            "messageId": message_context.message_id,
            "topicArn": subscriber.get("TopicArn"),
            "timestamp": datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f%z"),
        },
        "delivery": delivery,
        "status": "SUCCESS" if success else "FAILURE",
    }
    log_output = json.dumps(delivery_log)
    return store_cloudwatch_logs(log_group_name, log_stream_name, log_output, invocation_time)
def create_subscribe_url(external_url, topic_arn, subscription_token):