### 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_
AlarmName=alarm_name,
                AlarmDescription=alarm_description,
                MetricName=expected_trigger["MetricName"],
                Namespace=expected_trigger["Namespace"],
                ActionsEnabled=True,
                Period=expected_trigger["Period"],
                Threshold=expected_trigger["Threshold"],
                Dimensions=[{"Name": "InstanceId", "Value": "i-0317828c84edbe100"}],
                Unit=expected_trigger["Unit"],
                Statistic=expected_trigger["Statistic"].capitalize(),
                OKActions=[topic_arn_ok],
                AlarmActions=[topic_arn_alarm],
                EvaluationPeriods=expected_trigger["EvaluationPeriods"],
                ComparisonOperator=expected_trigger["ComparisonOperator"],
                TreatMissingData=expected_trigger["TreatMissingData"],
            )
            
            state_value = "ALARM"
            state_reason = "testing 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_alarm,
                expected_topic_arn=topic_arn_alarm,
                expected_new=state_value,