### 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_
sqs_client.delete_queue(QueueUrl=queue_url)
        # s
        # h
        queue_test_url = sqs_create_queue()
        test_subscription = sns_create_s(
            topic_arn=topic_arn, queue_url=queue_test_url
        )
        test_subscription_arn = test_subscription["SubscriptionArn"]
        # t
        message = "test_dlq_after_sqs_endpoint_deleted"
        sns_client.publish(TopicArn=topic_arn, Message=message)
        # t
        # w
        poll_condition(
            lambda: sqs_receive_num_messages(
                queue_url=queue_test_url, expected_messages=1, max_iterations=2
            ),
            timeout=10,
        )
        sns_client.unsubscribe(SubscriptionArn=test_subscription_arn)
        # w
        time.sleep(1)
        # c
        subscriptions = sns_client.list_subscriptions_by_topic(TopicArn=topic_arn)
        snapshot.match("subscriptions", subscriptions)
        # s
        sns_client.set_subscription_attributes(
            SubscriptionArn=subscription_arn,
            AttributeName="RedrivePolicy",
            AttributeValue=json.dumps({"deadLetterTargetArn": dlq_arn}),