### 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,
        name: topicName,
        attributes: TopicAttributesMap = None,
        tags: TagList = None,
        data_protection_policy: attributeValue = None,
    ) -> CreateTopicResponse:
        moto_response = call_moto(context)
        store = self.get_store()
        topic_arn = moto_response["TopicArn"]
        tag_resource_success = extract_tags(topic_arn, tags, True, store)
        if not tag_resource_success:
            raise InvalidParameterException(
                "Invalid parameter: Tags Reason: Topic already exists with different tags"
            )
        if tags:
            self.tag_resource(context=context, resource_arn=topic_arn, tags=tags)
        store.sns_subscriptions[topic_arn] = store.sns_subscriptions.get(topic_arn) or []
        return CreateTopicResponse(TopicArn=topic_arn)
def get_subscription_by_arn(sub_arn):
    store = SnsProvider.get_store()
    
    
    for key, subscriptions in store.sns_subscriptions.items():
        for sub in subscriptions:
            if sub["SubscriptionArn"] == sub_arn:
                return sub
def _get_tags(topic_arn):