### 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_
attributes["FilterPolicy"]
                )
        topic_subs.append(subscription)
        if subscription_arn not in store.subscription_status:
            store.subscription_status[subscription_arn] = {}
        subscription_token = short_uid()
        store.subscription_status[subscription_arn].update(
            {"TopicArn": topic_arn, "Token": subscription_token, "Status": "Not Subscribed"}
        )
        
        if protocol in ["http", "https"]:
            message_ctx = SnsMessage(
                type="SubscriptionConfirmation",
                token=subscription_token,
                message=f"You have chosen to subscribe to the topic {topic_arn}.\nTo confirm the subscription, visit the SubscribeURL included in this message.",
            )
            publish_ctx = SnsPublishContext(
                message=message_ctx, store=store, request_headers=context.request.headers
            )
            self._publisher.publish_to_topic_subscriber(
                ctx=publish_ctx,
                topic_arn=topic_arn,
                subscription_arn=subscription_arn,
            )
        elif protocol in ["sqs", "lambda"]:
            
            
            self.confirm_subscription(context, topic_arn, subscription_token)
        return SubscribeResponse(SubscriptionArn=subscription_arn)
    def tag_resource(