### 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_
if isinstance(val, str) and key == "SigningCertURL":
        pattern = re.compile(r".*SimpleNotificationService-(.*)?\.pem")
        match = re.match(pattern, val)
        if match:
            return match.groups()[0]
def _signing_cert_url_token_transformer(key: str, val: str) -> str:
    if isinstance(val, str) and key == "UnsubscribeURL":
        pattern = re.compile(r".*(?<=\?Action=Unsubscribe&SubscriptionArn=).*:(.*)")
        match = re.match(pattern, val)
        if match:
            return match.groups()[0]
def _replace_camel_string_with_hyphen(input_string: str):
    return "".join(["-" + char.lower() if char.isupper() else char for char in input_string]).strip(
        "-"
    )
def _log_stream_name_transformer(key: str, val: str) -> str: