Changed islice overload signature to match itertools

Author: Tesla2000

asyncstdlib/itertools.pyi

@@ -80,7 +80,7 @@ def filterfalse(
     predicate: Callable[[T], Any] | None, iterable: AnyIterable[T]
 ) -> AsyncIterator[T]: ...
 @overload
-def islice(iterable: AnyIterable[T], start: int | None, /) -> AsyncIterator[T]: ...
+def islice(iterable: AnyIterable[T], stop: int | None, /) -> AsyncIterator[T]: ...
 @overload
 def islice(
     iterable: AnyIterable[T],