Replace object | None with object (#9857)

All types, including `None`, are a subtype of `object`, so `None` is redundant in the union `object | None`.

Author: Károly Szabó

stubs/console-menu/consolemenu/console_menu.pyi

@@ -20,7 +20,7 @@ class ConsoleMenu:
     exit_item: ExitItem
     current_option: int
     selected_option: int
-    returned_value: object | None
+    returned_value: object
     should_exit: bool
     previous_active_menu: ConsoleMenu | None
     def __init__(

stubs/six/six/__init__.pyi

@@ -50,7 +50,7 @@ def create_unbound_method(func: types.FunctionType, cls: type) -> types.Function
 Iterator = object
 
 def get_method_function(meth: types.MethodType) -> types.FunctionType: ...
-def get_method_self(meth: types.MethodType) -> object | None: ...
+def get_method_self(meth: types.MethodType) -> object: ...
 def get_function_closure(fun: types.FunctionType) -> tuple[types._Cell, ...] | None: ...
 def get_function_code(fun: types.FunctionType) -> types.CodeType: ...
 def get_function_defaults(fun: types.FunctionType) -> tuple[Any, ...] | None: ...