Remove empty __init__ methods (#8816)

stdlib/concurrent/futures/_base.pyi

@@ -35,7 +35,6 @@ _T = TypeVar("_T")
 _P = ParamSpec("_P")
 
 class Future(Generic[_T]):
-    def __init__(self) -> None: ...
     def cancel(self) -> bool: ...
     def cancelled(self) -> bool: ...
     def running(self) -> bool: ...
@@ -90,14 +89,12 @@ def wait(fs: Iterable[Future[_T]], timeout: float | None = ..., return_when: str
 class _Waiter:
     event: threading.Event
     finished_futures: list[Future[Any]]
-    def __init__(self) -> None: ...
     def add_result(self, future: Future[Any]) -> None: ...
     def add_exception(self, future: Future[Any]) -> None: ...
     def add_cancelled(self, future: Future[Any]) -> None: ...
 
 class _AsCompletedWaiter(_Waiter):
     lock: threading.Lock
-    def __init__(self) -> None: ...
 
 class _FirstCompletedWaiter(_Waiter): ...
 

stdlib/concurrent/futures/process.pyi

@@ -19,7 +19,6 @@ class _ThreadWakeup:
     _closed: bool
     _reader: Connection
     _writer: Connection
-    def __init__(self) -> None: ...
     def close(self) -> None: ...
     def wakeup(self) -> None: ...
     def clear(self) -> None: ...