replace option with |None

v6d3vote/run-bot.py

@@ -1,5 +1,7 @@
+from __future__ import annotations
+
 import asyncio
-from typing import Optional, TypedDict
+from typing import TypedDict
 
 import discord
 from v6d3vote.config import myroot, prefix
@@ -142,8 +144,8 @@ class Poll:
         return loaded
 
     @classmethod
-    async def load(cls, message: discord.Message) -> Optional['Poll']:
-        saved: Optional[SavedPoll] = vote_db.get(message.id, None)
+    async def load(cls, message: discord.Message) -> Poll | None:
+        saved: SavedPoll | None = vote_db.get(message.id, None)
         if saved is None:
             return None
         assert message.guild is not None