### 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_
self, sns_client, cloudwatch_client, sqs_client, sns_create_topic, sqs_create_queue
    ):
        
        sns_topic_alarm = sns_create_topic()
        topic_arn_alarm = sns_topic_alarm["TopicArn"]
        sns_topic_ok = sns_create_topic()
        topic_arn_ok = sns_topic_ok["TopicArn"]
        
        uid = short_uid()
        queue_url_alarm = sqs_create_queue(QueueName=f"AlarmQueue-{uid}")
        queue_url_ok = sqs_create_queue(QueueName=f"OKQueue-{uid}")
        arn_queue_alarm = sqs_client.get_queue_attributes(
            QueueUrl=queue_url_alarm, AttributeNames=["QueueArn"]
        )["Attributes"]["QueueArn"]
        arn_queue_ok = sqs_client.get_queue_attributes(
            QueueUrl=queue_url_ok, AttributeNames=["QueueArn"]
        )["Attributes"]["QueueArn"]
        sqs_client.set_queue_attributes(
            QueueUrl=queue_url_alarm,
            Attributes={"Policy": get_sqs_policy(arn_queue_alarm, topic_arn_alarm)},