### 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_
expected_reason=state_reason,
                alarm_name=alarm_name,
                alarm_description=alarm_description,
                expected_trigger=expected_trigger,
            )
            
            state_value = "OK"
            state_reason = "resetting alarm"
            cloudwatch_client.set_alarm_state(
                AlarmName=alarm_name, StateReason=state_reason, StateValue=state_value
            )
            retry(
                check_message,
                retries=PUBLICATION_RETRIES,
                sleep_before=1,
                sqs_client=sqs_client,
                expected_queue_url=queue_url_ok,
                expected_topic_arn=topic_arn_ok,
                expected_new=state_value,
                expected_reason=state_reason,
                alarm_name=alarm_name,
                alarm_description=alarm_description,
                expected_trigger=expected_trigger,
            )
        finally:
            
            sns_client.unsubscribe(SubscriptionArn=subscription_alarm["SubscriptionArn"])
            sns_client.unsubscribe(SubscriptionArn=subscription_ok["SubscriptionArn"])
            cloudwatch_client.delete_alarms(AlarmNames=[alarm_name])
    def test_put_metric_alarm(