nipanel: Delete _typing submodule and use typing_extensions directly

pyproject.toml

@@ -11,6 +11,7 @@ python = "^3.9"
 grpcio = {version=">=1.49.0,<2.0"}
 protobuf = {version=">=4.21"}
 ni-measurement-plugin-sdk = {version=">=2.3"}
+typing-extensions = ">=4.13.2"
 
 [tool.poetry.group.dev.dependencies]
 types-grpcio = ">=1.0"

src/nipanel/_panel_client.py

@@ -4,15 +4,14 @@
 
 import logging
 import threading
-from typing import TypeVar, Callable
+from typing import Callable, TypeVar
 
 import grpc
 from ni.pythonpanel.v1.python_panel_service_pb2 import OpenPanelRequest
 from ni.pythonpanel.v1.python_panel_service_pb2_grpc import PythonPanelServiceStub
 from ni_measurement_plugin_sdk_service.discovery import DiscoveryClient
 from ni_measurement_plugin_sdk_service.grpc.channelpool import GrpcChannelPool
-
-from nipanel._typing import ParamSpec
+from typing_extensions import ParamSpec
 
 _P = ParamSpec("_P")
 _T = TypeVar("_T")