### 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_
import logging
import math
import threading
from datetime import datetime, timedelta, timezone
from typing import TYPE_CHECKING, List
from localstack.aws.api.cloudwatch import MetricAlarm, MetricDataQuery
from localstack.utils.aws import aws_stack
from localstack.utils.scheduler import Scheduler
if TYPE_CHECKING:
    from mypy_boto3_cloudwatch import CloudWatchClient
LOG = logging.getLogger(__name__)
COMPARISON_OPS = {
    "GreaterThanOrEqualToThreshold": (lambda value, threshold: value >= threshold),
    "GreaterThanThreshold": (lambda value, threshold: value > threshold),
    "LessThanThreshold": (lambda value, threshold: value < threshold),
    "LessThanOrEqualToThreshold": (lambda value, threshold: value <= threshold),
}
STATE_ALARM = "ALARM"
STATE_OK = "OK"
STATE_INSUFFICIENT_DATA = "INSUFFICIENT_DATA"
DEFAULT_REASON = "Alarm Evaluation"
THRESHOLD_CROSSED = "Threshold crossed"
THRESHOLD_OK = "Threshold ok"
INSUFFICIENT_DATA = "Insufficient Data"
class AlarmScheduler: