### 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_
)
        subscription_role_arn = role["Role"]["Arn"]
        if is_aws_cloud():
            time.sleep(10)
        s3_create_bucket(Bucket=bucket_name)
        stream = firehose_create_delivery_stream(
            DeliveryStreamName=stream_name,
            DeliveryStreamType="DirectPut",
            S3DestinationConfiguration={
                "RoleARN": subscription_role_arn,
                "BucketARN": f"arn:aws:s3:::{bucket_name}",
                "BufferingHints": {"SizeInMBs": 1, "IntervalInSeconds": 60},
            },
        )
        topic = sns_create_topic(Name=topic_name)
        sns_subscription(
            TopicArn=topic["TopicArn"],
            Protocol="firehose",
            Endpoint=stream["DeliveryStreamARN"],
            Attributes={"SubscriptionRoleArn": subscription_role_arn},
            ReturnSubscriptionArn=True,
        )
        message = json.dumps({"message": "hello world"})
        message_attributes = {
            "testAttribute": {"DataType": "String", "StringValue": "valueOfAttribute"}
        }
        sns_client.publish(
            TopicArn=topic["TopicArn"], Message=message, MessageAttributes=message_attributes
        )
        def validate_content():