### 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_
def mock_metric_alarm_details(alarm_arn):
            details = {
                "AlarmName": "test-alarm",
                "StateValue": "OK",
                "TreatMissingData": "notBreaching",
                "EvaluationPeriods": 1,
                "Period": 5,
                "ComparisonOperator": "LessThanThreshold",
                "Threshold": 1,
            }
            return details
        def mock_collect_metric_data(alarm_details, client):
            return [0.0, None, 0.0]
        run_and_assert_calculate_alarm_state(
            mock_metric_alarm_details, mock_collect_metric_data, 1, "ALARM"
        )
def run_and_assert_calculate_alarm_state(
    mock_metric_alarm_details, mock_collect_metric_data, expected_calls, expected_state
):
    mock_client = Mock()
    def mock_cloudwatch_client(alarm_arn):
        return mock_client