### 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_
self,
        context: RequestContext,
        subscription_arn: subscriptionARN,
        attribute_name: attributeName,
        attribute_value: attributeValue = None,
    ) -> None:
        sub = get_subscription_by_arn(subscription_arn)
        if not sub:
            raise NotFoundException("Subscription does not exist")
        validate_subscription_attribute(
            attribute_name=attribute_name,
            attribute_value=attribute_value,
            topic_arn=sub["TopicArn"],
        )
        try:
            call_moto(context)
        except CommonServiceException as e:
            
            if e.code == "InvalidParameter":
                raise InvalidParameterException(e.message)
            raise
        if attribute_name == "FilterPolicy":
            store = self.get_store()
            store.subscription_filter_policy[subscription_arn] = json.loads(attribute_value)
        sub[attribute_name] = attribute_value
    def confirm_subscription(