Update typing_extensions imports in third-party stubs (#11245)

stubs/caldav/caldav/objects.pyi

@@ -2,8 +2,8 @@ import datetime
 from _typeshed import Incomplete
 from collections import defaultdict
 from collections.abc import Callable, Container, Iterable, Iterator, Mapping, Sequence
-from typing import Any, TypeVar, overload
-from typing_extensions import Literal, Self, TypeAlias
+from typing import Any, Literal, TypeVar, overload
+from typing_extensions import Self, TypeAlias
 from urllib.parse import ParseResult, SplitResult
 
 from vobject.base import VBase