[Discord] Use datetime.UTC alias in AdventurePlayer.start_action method

Update to use datetime.UTC alias in AdventurePlayer.start_action method

Discord/cogs/adventure.py

@@ -404,7 +404,7 @@ async def inventory(self, item = None):
 	async def start_action(self, action, item):
 		self.last_action = action
 		self.last_action_item = item
-		self.last_action_time = datetime.datetime.now(datetime.timezone.utc)
+		self.last_action_time = datetime.datetime.now(datetime.UTC)
 		await self.bot.db.execute(
 			"""
 			UPDATE adventure.players