### 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_
LOG.debug("Error cleaning up platform application '%s': %s", platform_application, e)
class TestSNSSubscription:
    @pytest.mark.aws_validated
    def test_python_lambda_subscribe_sns_topic(
        self,
        sns_client,
        sns_create_topic,
        sns_subscription,
        lambda_client,
        lambda_su_role,
        create_lambda_function,
        logs_client,
        snapshot,
    ):
        function_name = f"lambda-function-{short_uid()}"
        permission_id = f"test-statement-{short_uid()}"
        subject = "[Subject] Test subject"
        message = "Hello world."
        topic_arn = sns_create_topic()["TopicArn"]
        lambda_creation_response = create_lambda_function(
            func_name=function_name,
            handler_file=TEST_LAMBDA_PYTHON_ECHO,
            runtime=Runtime.python3_7,
            role=lambda_su_role,
        )
        lambda_arn = lambda_creation_response["CreateFunctionResponse"]["FunctionArn"]
        lambda_client.add_permission(
            FunctionName=function_name,
            StatementId=permission_id,
            Action="lambda:InvokeFunction",