### 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_subscription_arn: boolean = None,
    ) -> SubscribeResponse:
        if not endpoint:
            
            raise NotFoundException("Endpoint not specified in subscription")
        if protocol not in sns_constants.SNS_PROTOCOLS:
            raise InvalidParameterException(
                f"Invalid parameter: Amazon SNS does not support this protocol string: {protocol}"
            )
        elif protocol in ["http", "https"] and not endpoint.startswith(f"{protocol}://"):
            raise InvalidParameterException(
                "Invalid parameter: Endpoint must match the specified protocol"
            )
        elif protocol == "sms" and not is_e164(endpoint):
            raise InvalidParameterException(f"Invalid SMS endpoint: {endpoint}")
        elif protocol == "sqs":
            try:
                parse_arn(endpoint)
            except InvalidArnException:
                raise InvalidParameterException("Invalid parameter: SQS endpoint ARN")
        if ".fifo" in endpoint and ".fifo" not in topic_arn:
            raise InvalidParameterException(
                "Invalid parameter: Invalid parameter: Endpoint Reason: FIFO SQS Queues can not be subscribed to standard SNS topics"
            )
        elif ".fifo" in topic_arn and ".fifo" not in endpoint:
            raise InvalidParameterException(
                "Invalid parameter: Invalid parameter: Endpoint Reason: Please use FIFO SQS queue"
            )
        if attributes:
            for attr_name, attr_value in attributes.items():