Incorrect _DEFAULT typing for ConnectionParameters arguments

[rqueue]

For the ConnectionParameters, the type are defined as follows:

class ConnectionParameters(Parameters):

    class _DEFAULT:
        ...

    def __init__(
        self,
        host: Union[str, _DEFAULT] = ...,
        port: Union[int, _DEFAULT] = ...,
        virtual_host: Union[str, _DEFAULT] = ...,
        credentials: Union[credentials_.VALID_TYPES, _DEFAULT] = ...,
        channel_max: Union[int, _DEFAULT] = ...,
        frame_max: Union[int, _DEFAULT] = ...,
        heartbeat: Union[int, _OnHeartbeatTimeoutCallback, None, _DEFAULT] = ...,
        ssl_options: Union[SSLOptions, _DEFAULT] = ...,
        connection_attempts: Union[int, _DEFAULT] = ...,
        retry_delay: Union[numbers.Real, _DEFAULT] = ...,
        socket_timeout: Union[numbers.Real, _DEFAULT] = ...,
        stack_timeout: Union[numbers.Real, _DEFAULT] = ...,
        locale: Union[str, _DEFAULT] = ...,
        blocked_connection_timeout: Union[numbers.Real, None, _DEFAULT] = ...,
        client_properties: Union[Mapping[str, Any], None, _DEFAULT] = ...,
        tcp_options: Union[Mapping[str, Any], None, _DEFAULT] = ...,
        **kwargs: Any,
    ): ...

The _DEFAULT type defined expects an instance, but the actual method only checks for the _DEFAULT type itself. I believe the _DEFAULT type should be changed to Type[_DEFAULT]:

class ConnectionParameters(Parameters):

    class _DEFAULT:
        ...

    def __init__(
        self,
        host: Union[str, Type[_DEFAULT]] = ...,
        port: Union[int, Type[_DEFAULT]] = ...,
        virtual_host: Union[str, Type[_DEFAULT]] = ...,
        credentials: Union[credentials_.VALID_TYPES, Type[_DEFAULT]] = ...,
        channel_max: Union[int, Type[_DEFAULT]] = ...,
        frame_max: Union[int, Type[_DEFAULT]] = ...,
        heartbeat: Union[int, _OnHeartbeatTimeoutCallback, None, Type[_DEFAULT]] = ...,
        ssl_options: Union[SSLOptions, Type[_DEFAULT]] = ...,
        connection_attempts: Union[int, Type[_DEFAULT]] = ...,
        retry_delay: Union[numbers.Real, Type[_DEFAULT]] = ...,
        socket_timeout: Union[numbers.Real, Type[_DEFAULT]] = ...,
        stack_timeout: Union[numbers.Real, Type[_DEFAULT]] = ...,
        locale: Union[str, Type[_DEFAULT]] = ...,
        blocked_connection_timeout: Union[numbers.Real, None, Type[_DEFAULT]] = ...,
        client_properties: Union[Mapping[str, Any], None, Type[_DEFAULT]] = ...,
        tcp_options: Union[Mapping[str, Any], None, Type[_DEFAULT]] = ...,
        **kwargs: Any,
    ): ...