pyright workaround

Author: mantasu

stdlib/typing.pyi

@@ -440,10 +440,12 @@ Annotated: _SpecialForm
 AnyStr = TypeVar("AnyStr", str, bytes)  # noqa: Y001
 
 if sys.version_info >= (3, 12):
-    class Generic:
+    @type_check_only
+    class _Generic:
         @classmethod
         def __class_getitem__(cls, args: TypeVar | ParamSpec | tuple[TypeVar | ParamSpec, ...]) -> _Final: ...
-
+    
+    Generic: type[_Generic]
 else:
     # Dummy case; true definition accessible in typing
     Generic: _SpecialForm