### 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_
SnsApplicationPlatforms,
    SnsMessage,
    SnsStore,
    SnsSubscription,
)
from localstack.utils.aws import aws_stack
from localstack.utils.aws.arns import (
    extract_region_from_arn,
    extract_resource_from_arn,
    parse_arn,
    sqs_queue_url_for_arn,
)
from localstack.utils.aws.aws_responses import create_sqs_system_attributes
from localstack.utils.aws.dead_letter_queue import sns_error_to_dead_letter_queue
from localstack.utils.cloudwatch.cloudwatch_util import store_cloudwatch_logs
from localstack.utils.objects import not_none_or
from localstack.utils.strings import long_uid, md5, to_bytes
from localstack.utils.time import timestamp_millis
LOG = logging.getLogger(__name__)
@dataclass
class SnsPublishContext:
    message: SnsMessage
    store: SnsStore
    request_headers: Dict[str, str]
@dataclass
class SnsBatchPublishContext:
    messages: List[SnsMessage]
    store: SnsStore
    request_headers: Dict[str, str]
class TopicPublisher(abc.ABC):