### 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_
files = s3_client.list_objects(Bucket=bucket_name)["Contents"]
            f = BytesIO()
            s3_client.download_fileobj(bucket_name, files[0]["Key"], f)
            content = to_str(f.getvalue())
            sns_message = json.loads(content.split("\n")[0])
            assert "Type" in sns_message
            assert "MessageId" in sns_message
            assert "Message" in sns_message
            assert "Timestamp" in sns_message
            assert message == sns_message["Message"]
        retries = 5
        sleep = 1
        sleep_before = 0
        if is_aws_cloud():
            retries = 30
            sleep = 10
            sleep_before = 10
        retry(validate_content, retries=retries, sleep_before=sleep_before, sleep=sleep)
    @pytest.mark.aws_validated
    def test_empty_or_wrong_message_attributes(