### 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_
@patch(target=FakeAlarm.update_state)
def update_state(target, self, reason, reason_data, state_value):
    old_state = self.state_value
    target(self, reason, reason_data, state_value)
    
    if not self.actions_enabled or old_state == self.state_value:
        return
    if self.state_value == "OK":
        actions = self.ok_actions
    elif self.state_value == "ALARM":
        actions = self.alarm_actions
    else:
        actions = self.insufficient_data_actions
    for action in actions:
        data = aws_stack.parse_arn(action)
        
        if data["service"] == "sns":
            service = aws_stack.connect_to_service(data["service"])
            subject = f"""{self.state_value}: "{self.name}" in {self.region_name}"""
            message = create_message_response_update_state(self, old_state)
            service.publish(TopicArn=action, Subject=subject, Message=message)
        else:
            
            LOG.warning(
                "Action for service %s not implemented, action '%s' will not be triggered.",
                data["service"],
                action,
            )
@patch(target=CloudWatchBackend.put_metric_alarm)
def put_metric_alarm(