### 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 self.table_exists(ddb_client, data["TableName"]):
                return error_response(
                    message="Table already created",
                    error_type="ResourceInUseException",
                    code=400,
                )
        elif action == "CreateGlobalTable":
            return create_global_table(data)
        elif action == "DescribeGlobalTable":
            return describe_global_table(data)
        elif action == "ListGlobalTables":
            return list_global_tables(data)
        elif action == "UpdateGlobalTable":
            return update_global_table(data)
        elif action in ("PutItem", "UpdateItem", "DeleteItem"):
            
            
            try:
                if has_event_sources_or_streams_enabled(data["TableName"]):
                    ProxyListenerDynamoDB.thread_local.existing_item = (
                        ItemFinder.find_existing_item(data)
                    )
            except Exception as e:
                if "ResourceNotFoundException" in str(e):
                    return get_table_not_found_error()
                raise
            
            
            if (
                (data.get("ReturnValues") == "ALL_OLD") or (not data.get("ReturnValues"))