### 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_
"MessageGroupId": message_group_id,
                "Message": "Test Message without attribute",
                "Subject": "Subject",
            },
        ]
        if not content_based_deduplication:
            for index, message in enumerate(publish_batch_request_entries):
                message["MessageDeduplicationId"] = f"MessageDeduplicationId-{index}"
        publish_batch_response = sns_client.publish_batch(
            TopicArn=topic_arn,
            PublishBatchRequestEntries=publish_batch_request_entries,
        )
        snapshot.match("publish-batch-response-fifo", publish_batch_response)
        assert "Successful" in publish_batch_response
        assert "Failed" in publish_batch_response
        for successful_resp in publish_batch_response["Successful"]:
            assert "Id" in successful_resp
            assert "MessageId" in successful_resp
        message_ids_received = set()
        messages = []
        def get_messages():
            # d
            # M
            sqs_response = sqs_client.receive_message(
                QueueUrl=queue_url,
                MessageAttributeNames=["All"],
                AttributeNames=["All"],
                MaxNumberOfMessages=10,
                WaitTimeSeconds=1,
                VisibilityTimeout=10,