### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When attempting to sign some document using Localstack KMS inside a lambda container (also running on localstack), the localstack KMS listener returns some unknown error.

The KMS key and lambda containers have been created from the same CDK app deploy, and I can see all the resources in the localstack web console.

The test application I'm using to prove this behaviour is available here:
https://github.com/LukaHedt/localstack_kms_test

Instructions to run are in the main Readme, and the `/localstack/Readme.md` file.

`aws-sdk` returns an unknown error, and the localstack docker logs that I receive are available here:
https://pastebin.com/58Z3fXi3

Have done an amount of testing and can confidently claim the following:
- Have tested on multiple machines with the same outcome
- Doesn’t make a difference if I specify an ARN or a KeyID in the signing request
- Downgrading localstack versions either didn’t make a difference, or I couldn’t actually deploy a localstack container with version 0.12.20 or lower.

### Expected Behavior

KMS Sign should return a signature for the given payload.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

Test application demonstrating the current behaviour is available here:

https://github.com/LukaHedt/localstack_kms_test

Full instructions to run are in the `/localstack/Readme.md` file.


### Environment

```markdown
- OS: MacOS Monteray 12.3
- LocalStack: 0.14.0
```


### Anything else?

_No response_
)
        )
        return bool(filtered)
class ProxyListenerDynamoDB(ProxyListener):
    thread_local = threading.local()
    def __init__(self):
        self._table_ttl_map = {}
    @staticmethod
    def table_exists(ddb_client, table_name):
        return aws_stack.dynamodb_table_exists(table_name, client=ddb_client)
    def action_should_throttle(self, action, actions):
        throttled = ["%s%s" % (ACTION_PREFIX, a) for a in actions]
        return (action in throttled) or (action in actions)
    def should_throttle(self, action):
        rand = random.random()
        if rand < config.DYNAMODB_READ_ERROR_PROBABILITY and self.action_should_throttle(
            action, READ_THROTTLED_ACTIONS
        ):
            return True
        elif rand < config.DYNAMODB_WRITE_ERROR_PROBABILITY and self.action_should_throttle(
            action, WRITE_THROTTLED_ACTIONS
        ):
            return True
        elif rand < config.DYNAMODB_ERROR_PROBABILITY and self.action_should_throttle(
            action, THROTTLED_ACTIONS
        ):
            return True
        else:
            return False
    def forward_request(self, method, path, data, headers):