fix: Update TypedDict version bound

We're using a feature that didn't make it into `3.13` yet https://peps.python.org/pep-0728/

altair/vegalite/v5/api.py

@@ -33,7 +33,7 @@
 from .schema._typing import Map
 from .theme import themes
 
-if sys.version_info >= (3, 13):
+if sys.version_info >= (3, 14):
     from typing import TypedDict
 else:
     from typing_extensions import TypedDict