### 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"]
        sqs_queue = sqs_create_queue()
        arn_queue = sqs_client.get_queue_attributes(
            QueueUrl=sqs_queue, AttributeNames=["QueueArn"]
        )["Attributes"]["QueueArn"]
        
        sqs_client.set_queue_attributes(
            QueueUrl=sqs_queue,
            Attributes={"Policy": get_sqs_policy(arn_queue, topic_arn_alarm)},
        )
        metric_name = "my-metric1"
        dimension = [{"Name": "InstanceId", "Value": "abc"}]
        namespace = "test/nsp"
        alarm_name = f"test-alarm-{short_uid()}"
        try:
            subscription = sns_client.subscribe(
                TopicArn=topic_arn_alarm, Protocol="sqs", Endpoint=arn_queue
            )
            data = [
                {
                    "MetricName": metric_name,
                    "Dimensions": dimension,
                    "Value": 21,
                    "Timestamp": datetime.utcnow().replace(tzinfo=timezone.utc),