[stdlib] Add missing pickle methods in multiprocessing.queues

Signed-off-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>

Author: emmanuel-ferdman

stdlib/multiprocessing/queues.pyi

@@ -10,6 +10,8 @@ class Queue(Generic[_T]):
     # FIXME: `ctx` is a circular dependency and it's not actually optional.
     # It's marked as such to be able to use the generic Queue in __init__.pyi.
     def __init__(self, maxsize: int = 0, *, ctx: Any = ...) -> None: ...
+    def __getstate__(self) -> object: ...
+    def __setstate__(self, state: object) -> None: ...
     def put(self, obj: _T, block: bool = True, timeout: float | None = None) -> None: ...
     def get(self, block: bool = True, timeout: float | None = None) -> _T: ...
     def qsize(self) -> int: ...
@@ -31,6 +33,8 @@ class SimpleQueue(Generic[_T]):
     def __init__(self, *, ctx: Any = ...) -> None: ...
     def close(self) -> None: ...
     def empty(self) -> bool: ...
+    def __getstate__(self) -> object: ...
+    def __setstate__(self, state: object) -> None: ...
     def get(self) -> _T: ...
     def put(self, obj: _T) -> None: ...
     def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...