stdlib: add many missing __del__ methods (#11042)

stdlib/subprocess.pyi

@@ -2564,6 +2564,7 @@ class Popen(Generic[AnyStr]):
     def __exit__(
         self, exc_type: type[BaseException] | None, value: BaseException | None, traceback: TracebackType | None
     ) -> None: ...
+    def __del__(self) -> None: ...
     if sys.version_info >= (3, 9):
         def __class_getitem__(cls, item: Any) -> GenericAlias: ...