### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When calling 

`cloudWatchClient.EnableAlarmActions(&cloudwatch.EnableAlarmActionsInput{AlarmNames: alarmNames})`

with golang I receive a SerializationError with bytes in the error message saying: 

`<!DOCTYPE HTM |UBLIC "-//W3C//DTD HTML 3.2 Final//EN">.<title>500 Internal Server Error</title>.<h1>Internal Server Error</h1>.<p>The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.`

I believe this is a bug, since other cloudwatch operations like "DescribeAlarms" work flawlessly with the same client.

### Expected Behavior

I expected the call to go through without any errors

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

Start localstack, create alarms and call cloudwatch "EnableAlarmActions"

### Environment

_No response_

### Anything else?

_No response_
"""
        :return: array with Transformers, for sqs api.
        """
        return [
            TransformerUtility.key_value("ReceiptHandle"),
            TransformerUtility.key_value("SenderId"),
            TransformerUtility.jsonpath("$..MessageAttributes.RequestID.StringValue", "request-id"),
            KeyValueBasedTransformer(_resource_name_transformer, "resource"),
            KeyValueBasedTransformer(_signing_cert_url_token_transformer, replacement="token"),
            KeyValueBasedTransformer(
                _sns_pem_file_token_transformer, replacement="signing-cert-file"
            ),
            
            TransformerUtility.regex(
                re.compile(
                    r"(?<=UnsubscribeURL[\"|']:\s[\"|'])(https?.*?)(?=/\?Action=Unsubscribe)"
                ),
                replacement="<unsubscribe-domain>",
            ),
        ]
    
    
    
    
def _sns_pem_file_token_transformer(key: str, val: str) -> str: