### 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_
sqs_client,
    expected_queue_url,
    expected_topic_arn,
    expected_new,
    expected_reason,
    alarm_name,
    alarm_description,
    expected_trigger,
):
    receive_result = sqs_client.receive_message(QueueUrl=expected_queue_url)
    message = None
    for msg in receive_result["Messages"]:
        body = json.loads(msg["Body"])
        if body["TopicArn"] == expected_topic_arn:
            message = json.loads(body["Message"])
            receipt_handle = msg["ReceiptHandle"]
            sqs_client.delete_message(QueueUrl=expected_queue_url, ReceiptHandle=receipt_handle)
            break
    assert message["NewStateValue"] == expected_new
    assert message["NewStateReason"] == expected_reason
    assert message["AlarmName"] == alarm_name
    assert message["AlarmDescription"] == alarm_description
    assert message["Trigger"] == expected_trigger
    return message
def get_sqs_policy(sqs_queue_arn, sns_topic_arn):