bs4: NavigableString accepts ReadableBuffer (#10106)

It delegates to str.__new__.

Author: JelleZijlstra

stubs/beautifulsoup4/bs4/element.pyi

@@ -1,4 +1,4 @@
-from _typeshed import Incomplete
+from _typeshed import Incomplete, ReadableBuffer
 from collections.abc import Callable, Iterable, Iterator
 from re import Pattern
 from typing import Any, Generic, TypeVar, overload
@@ -182,7 +182,7 @@ class NavigableString(str, PageElement):
     PREFIX: str
     SUFFIX: str
     known_xml: bool | None
-    def __new__(cls, value: str | bytes) -> Self: ...
+    def __new__(cls, value: str | ReadableBuffer) -> Self: ...
     def __copy__(self) -> Self: ...
     def __getnewargs__(self) -> tuple[str]: ...
     def output_ready(self, formatter: Formatter | str | None = "minimal") -> str: ...