https://github.com/localstack/localstack/blob/e7efc768a20e75feafe3702a5a6e477a233feff2/localstack/utils/aws/aws_stack.py#L904

```
File "/usr/local/lib/python3.8/site-packages/localstack/services/generic_proxy.py", line 50, in <module>
from localstack.utils.aws import aws_stack
File "/usr/local/lib/python3.8/site-packages/localstack/utils/aws/aws_stack.py", line 904, in <module>
) -> dict[str, str]:
TypeError: 'type' object is not subscriptable
```

Please fix to `Dict[str, str]`
cache,
        internal=False,
        aws_access_key_id=aws_access_key_id,
        aws_secret_access_key="__test_key__",
        *args,
        **kwargs,
    )
def get_s3_hostname():
    global CACHE_S3_HOSTNAME_DNS_STATUS
    if CACHE_S3_HOSTNAME_DNS_STATUS is None:
        try:
            assert socket.gethostbyname(S3_VIRTUAL_HOSTNAME)
            CACHE_S3_HOSTNAME_DNS_STATUS = True
        except socket.error:
            CACHE_S3_HOSTNAME_DNS_STATUS = False
    if CACHE_S3_HOSTNAME_DNS_STATUS:
        return S3_VIRTUAL_HOSTNAME
    return LOCALHOST
def generate_presigned_url(*args, **kwargs):
    endpoint_url = kwargs.pop("endpoint_url", None)
    s3_client = connect_to_service(
        "s3",
        endpoint_url=endpoint_url,
        cache=False,
        
        aws_access_key_id=TEST_AWS_ACCESS_KEY_ID,
        aws_secret_access_key=TEST_AWS_SECRET_ACCESS_KEY,
    )
    return s3_client.generate_presigned_url(*args, **kwargs)
def check_valid_region(headers):