### 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_
if data.get("Enabled"):
            kms_master_key_id = data.get("KMSMasterKeyId")
            if not kms_master_key_id:
                
                kms_master_key_id = cls.get_sse_kms_managed_key()
            kms_master_key_id = aws_stack.kms_key_arn(kms_master_key_id)
            return {
                "Status": "ENABLED",
                "SSEType": "KMS",  
                "KMSMasterKeyArn": kms_master_key_id,
            }
        return {}
def handle_special_request(method, path, data, headers):
    if path.startswith("/shell") or method == "GET":
        if path == "/shell":
            headers = {"Refresh": "0; url=%s/shell/" % config.service_url("dynamodb")}
            return aws_responses.requests_response("", headers=headers)
        return True
    if method == "OPTIONS":
        return 200
def create_global_table(data):