refactor(autorenewal): clean up imports and simplify error handling

bot/main.py

@@ -1,4 +1,5 @@
 import asyncio
+import contextlib
 import logging
 
 from aiogram import Bot, Dispatcher
@@ -21,6 +22,7 @@ from services.renewal_service import RenewalService
 from services.user_service import UserService
 
 logging.basicConfig(level=logging.DEBUG)
+contextlib.suppress(asyncio.CancelledError)
 
 
 async def main():
@@ -78,10 +80,7 @@ async def main():
         await dp.start_polling(bot)
     finally:
         scheduler_task.cancel()
-        try:
-            await scheduler_task
-        except asyncio.CancelledError:
-            pass
+        await scheduler_task
 
 
 if __name__ == "__main__":