### 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_
subscriber: SnsSubscription, attributes: MessageAttributeMap
    ) -> MessageBodyAttributeMap:
        message_attributes = {}
        
        if not is_raw_message_delivery(subscriber):
            return message_attributes
        for key, value in attributes.items():
            if data_type := value.get("DataType"):
                attribute = {"DataType": data_type}
                if data_type.startswith("Binary"):
                    val = value.get("BinaryValue")
                    attribute["BinaryValue"] = base64.b64decode(to_bytes(val))
                    
                    
                    if not attribute["BinaryValue"]:
                        attribute["BinaryValue"] = val
                else:
                    val = value.get("StringValue", "")
                    attribute["StringValue"] = str(val)
                message_attributes[key] = attribute
        return message_attributes
class SqsBatchTopicPublisher(SqsTopicPublisher):