fix type for multiprocessing.log_to_stderr(): allow int level (#9334)

Co-authored-by: AlexWaygood <alex.waygood@gmail.com>

stdlib/multiprocessing/context.pyi

@@ -2,7 +2,7 @@ import ctypes
 import sys
 from collections.abc import Callable, Iterable, Sequence
 from ctypes import _CData
-from logging import Logger
+from logging import Logger, _Level as _LoggingLevel
 from multiprocessing import popen_fork, popen_forkserver, popen_spawn_posix, popen_spawn_win32, queues, synchronize
 from multiprocessing.managers import SyncManager
 from multiprocessing.pool import Pool as _Pool
@@ -107,7 +107,7 @@ class BaseContext:
     ) -> Any: ...
     def freeze_support(self) -> None: ...
     def get_logger(self) -> Logger: ...
-    def log_to_stderr(self, level: str | None = ...) -> Logger: ...
+    def log_to_stderr(self, level: _LoggingLevel | None = ...) -> Logger: ...
     def allow_connection_pickling(self) -> None: ...
     def set_executable(self, executable: str) -> None: ...
     def set_forkserver_preload(self, module_names: list[str]) -> None: ...

stdlib/multiprocessing/util.pyi

@@ -1,7 +1,7 @@
 import threading
 from _typeshed import Incomplete, ReadableBuffer, SupportsTrunc
 from collections.abc import Callable, Iterable, Mapping, MutableMapping, Sequence
-from logging import Logger
+from logging import Logger, _Level as _LoggingLevel
 from typing import Any, SupportsInt
 from typing_extensions import SupportsIndex
 
@@ -37,7 +37,7 @@ def debug(msg: object, *args: object) -> None: ...
 def info(msg: object, *args: object) -> None: ...
 def sub_warning(msg: object, *args: object) -> None: ...
 def get_logger() -> Logger: ...
-def log_to_stderr(level: int | None = ...) -> Logger: ...
+def log_to_stderr(level: _LoggingLevel | None = ...) -> Logger: ...
 def is_abstract_socket_namespace(address: str | bytes | None) -> bool: ...
 
 abstract_sockets_supported: bool