### 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_
lambda_name = f"test-{short_uid()}"
        lambda_arn = create_lambda_function(
            func_name=lambda_name,
            libs=TEST_LAMBDA_LIBS,
            handler_file=TEST_LAMBDA_PYTHON,
            runtime=LAMBDA_RUNTIME_PYTHON37,
            role=lambda_su_role,
        )["CreateFunctionResponse"]["FunctionArn"]
        subscription = sns_subscription(TopicArn=topic_arn, Protocol="lambda", Endpoint=lambda_arn)
        sns_client.set_subscription_attributes(
            SubscriptionArn=subscription["SubscriptionArn"],
            AttributeName="RedrivePolicy",
            AttributeValue=json.dumps({"deadLetterTargetArn": dlq_arn}),
        )
        response_attributes = sns_client.get_subscription_attributes(
            SubscriptionArn=subscription["SubscriptionArn"]
        )
        snapshot.match("subscription-attributes", response_attributes)
        lambda_client.delete_function(FunctionName=lambda_name)
        sns_client.publish(
            TopicArn=topic_arn,
            Message="test_redrive_policy",
            MessageAttributes={"attr1": {"DataType": "Number", "StringValue": "1"}},
        )
        response = sqs_client.receive_message(
            QueueUrl=dlq_url, WaitTimeSeconds=10, MessageAttributeNames=["All"]
        )
        snapshot.match("messages", response)
    @pytest.mark.aws_validated
    def test_publish_with_empty_subject(self, sns_client, sns_create_topic, snapshot):