improve typing

jellyfin/models.py

@@ -1,5 +1,6 @@
 from pydantic import BaseModel
 from enum import Enum
+from typing import Optional
 
 
 class JellyfinMediaType(str, Enum):
@@ -13,6 +14,6 @@ class JellyfinMediaItem(BaseModel):
     name: str
     type: JellyfinMediaType
     image_url: str
-    start: int | None
-    end: int | None
+    start: Optional[int]
+    end: Optional[int]
     metadata: dict