Amend annotation for asyncio.Protocol.__slots__ (#14980)

stdlib/asyncio/protocols.pyi

@@ -14,7 +14,7 @@ class BaseProtocol:
 
 class Protocol(BaseProtocol):
     # Need annotation or mypy will complain about 'Cannot determine type of "__slots__" in base class'
-    __slots__: tuple[()] = ()
+    __slots__: tuple[str, ...] = ()
     def data_received(self, data: bytes) -> None: ...
     def eof_received(self) -> bool | None: ...
 
@@ -35,7 +35,7 @@ class DatagramProtocol(BaseProtocol):
     def error_received(self, exc: Exception) -> None: ...
 
 class SubprocessProtocol(BaseProtocol):
-    __slots__: tuple[()] = ()
+    __slots__: tuple[str, ...] = ()
     def pipe_data_received(self, fd: int, data: bytes) -> None: ...
     def pipe_connection_lost(self, fd: int, exc: Exception | None) -> None: ...
     def process_exited(self) -> None: ...

stubs/protobuf/google/protobuf/internal/well_known_types.pyi

@@ -67,7 +67,7 @@ _StructValue: TypeAlias = struct_pb2.Struct | struct_pb2.ListValue | str | float
 _StructValueArg: TypeAlias = _StructValue | Mapping[str, _StructValueArg] | Sequence[_StructValueArg]
 
 class Struct:
-    __slots__: tuple[()] = ()
+    __slots__: tuple[str, ...] = ()
     def __getitem__(self, key: str) -> _StructValue: ...
     def __setitem__(self, key: str, value: _StructValueArg) -> None: ...
     def __delitem__(self, key: str) -> None: ...
@@ -81,7 +81,7 @@ class Struct:
     def update(self, dictionary: SupportsItems[str, _StructValueArg]) -> None: ...
 
 class ListValue:
-    __slots__: tuple[()] = ()
+    __slots__: tuple[str, ...] = ()
     def __len__(self) -> int: ...
     def append(self, value: _StructValue) -> None: ...
     def extend(self, elem_seq: Iterable[_StructValue]) -> None: ...

stubs/protobuf/google/protobuf/message.pyi

@@ -12,7 +12,7 @@ class DecodeError(Error): ...
 class EncodeError(Error): ...
 
 class Message:
-    __slots__: tuple[()] = ()
+    __slots__: tuple[str, ...] = ()
     DESCRIPTOR: Descriptor | _upb_Descriptor
     def __deepcopy__(self, memo: Any = None) -> Self: ...
     def __eq__(self, other_msg): ...