Use typing_extensions.Self instead of _typeshed.Self (#9702)

stubs/click-spinner/click_spinner/__init__.pyi

@@ -1,9 +1,8 @@
 import threading
-from _typeshed import Self
 from collections.abc import Iterator
 from types import TracebackType
 from typing import Protocol
-from typing_extensions import Literal
+from typing_extensions import Literal, Self
 
 __version__: str
 
@@ -24,7 +23,7 @@ class Spinner:
     def start(self) -> None: ...
     def stop(self) -> None: ...
     def init_spin(self) -> None: ...
-    def __enter__(self: Self) -> Self: ...
+    def __enter__(self) -> Self: ...
     def __exit__(
         self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
     ) -> Literal[False]: ...