stdlib: add many missing __del__ methods (#11042)

stdlib/asyncio/sslproto.pyi

@@ -83,6 +83,8 @@ class _SSLProtocolTransport(transports._FlowControlMixin, transports.Transport):
         def set_read_buffer_limits(self, high: int | None = None, low: int | None = None) -> None: ...
         def get_read_buffer_size(self) -> int: ...
 
+    def __del__(self) -> None: ...
+
 if sys.version_info >= (3, 11):
     _SSLProtocolBase: TypeAlias = protocols.BufferedProtocol
 else: