improved code by mypy advice

schedule.py

@@ -2,12 +2,13 @@ from app_class import AppClass
 from config import Config
 from trigger import Trigger
 import asyncio
+from asyncio import Task
 
 
 class TriggerScheduler(AppClass):
     def __init__(self, _config: Config) -> None:
         super().__init__(_config)
-        self.tasks = []
+        self.tasks: list[Task] = []
         
     async def trigger(self, _trigger: Trigger) -> None:
         """Run a trigger with a specific name at a given interval."""