Fix errors when type checking stdlib with Python 3.14 (#13977)

stdlib/typing.pyi

@@ -37,7 +37,6 @@ __all__ = [
     "AsyncIterator",
     "Awaitable",
     "BinaryIO",
-    "ByteString",
     "Callable",
     "ChainMap",
     "ClassVar",
@@ -106,6 +105,9 @@ __all__ = [
     "runtime_checkable",
 ]
 
+if sys.version_info < (3, 14):
+    __all__ += ["ByteString"]
+
 if sys.version_info >= (3, 10):
     __all__ += ["Concatenate", "ParamSpec", "ParamSpecArgs", "ParamSpecKwargs", "TypeAlias", "TypeGuard", "is_typeddict"]