third-party stubs: Add several missing __del__ methods (#11054)

stubs/JACK-Client/jack/__init__.pyi

@@ -82,6 +82,7 @@ class Client:
     ) -> None: ...
     def __enter__(self) -> Self: ...
     def __exit__(self, *args: Unused) -> None: ...
+    def __del__(self) -> None: ...
     @property
     def name(self) -> str: ...
     @property