### 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 filter_key not in data or grant[filter_key] == data[filter_key]
def filter_grantee_principal(grant, data):
    return filter_if_present(grant, data, GRANTEE_PRINCIPAL)
def filter_grant_id(grant, data):
    return filter_if_present(grant, data, GRANT_ID)
def handle_list_grants(data):
    if KEY_ID not in data:
        raise ValidationException("KeyId must be specified")
    region_details = KMSBackend.get()
    verify_key_exists(data[KEY_ID])
    limit = data.get("Limit", 50)
    if "Marker" in data:
        filtered = region_details.markers.get(data["Marker"], [])
    else:
        filtered = [
            grant
            for grant in region_details.grants.values()
            if grant[KEY_ID] == data[KEY_ID]
            and filter_grant_id(grant, data)
            and filter_grantee_principal(grant, data)
        ]
    if len(filtered) <= limit:
        return {"Grants": filtered, "Truncated": False}
    in_limit = filtered[:limit]
    out_limit = filtered[limit:]
    marker_id = long_uid()
    region_details.markers[marker_id] = out_limit
    return {"Grants": in_limit, "Truncated": True, "NextMarker": marker_id}
def handle_retire_grant(data):