### 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_
result = sqs_client.receive_message(QueueUrl=sqs_queue, VisibilityTimeout=0)
                msg = result["Messages"][0]
                body = json.loads(msg["Body"])
                message = json.loads(body["Message"])
                receipt_handle = msg["ReceiptHandle"]
                sqs_client.delete_message(QueueUrl=sqs_queue, ReceiptHandle=receipt_handle)
                assert message["NewStateValue"] == expected_state
            retry(check_alarm_triggered, retries=60, sleep=3.0, expected_state="ALARM")
            
            retry(
                check_alarm_triggered, retries=60, sleep=3.0, sleep_before=25, expected_state="OK"
            )
        finally:
            sns_client.unsubscribe(SubscriptionArn=subscription["SubscriptionArn"])
            cloudwatch_client.delete_alarms(AlarmNames=[alarm_name])
def check_message(