Prevent update handling task pointers from being garbage collected, b…

…ackport of #1328 (#1331)

* Preserve update handling task pointers, backport of #1328

* Changelog

* Typing improvements

CHANGES/1331.misc

@@ -0,0 +1 @@
+Prevent update handling task pointers from being garbage collected, backport from 2.x

aiogram/dispatcher/dispatcher.py

@@ -6,7 +6,7 @@
 import warnings
 from asyncio import CancelledError, Event, Future, Lock
 from contextlib import suppress
-from typing import Any, AsyncGenerator, Dict, List, Optional, Union
+from typing import Any, AsyncGenerator, Dict, List, Optional, Set, Union
 
 from .. import loggers
 from ..client.bot import Bot
@@ -95,6 +95,7 @@ def __init__(
         self._running_lock = Lock()
         self._stop_signal: Optional[Event] = None
         self._stopped_signal: Optional[Event] = None
+        self._handle_update_tasks: Set[asyncio.Task[Any]] = set()
 
     def __getitem__(self, item: str) -> Any:
         return self.workflow_data[item]
@@ -349,7 +350,9 @@ async def _polling(
             ):
                 handle_update = self._process_update(bot=bot, update=update, **kwargs)
                 if handle_as_tasks:
-                    asyncio.create_task(handle_update)
+                    handle_update_task = asyncio.create_task(handle_update)
+                    self._handle_update_tasks.add(handle_update_task)
+                    handle_update_task.add_done_callback(self._handle_update_tasks.discard)
                 else:
                     await handle_update
         finally:

aiogram/webhook/aiohttp_server.py

@@ -2,7 +2,7 @@
 import secrets
 from abc import ABC, abstractmethod
 from asyncio import Transport
-from typing import Any, Awaitable, Callable, Dict, Optional, Tuple, cast
+from typing import Any, Awaitable, Callable, Dict, Optional, Set, Tuple, cast
 
 from aiohttp import MultipartWriter, web
 from aiohttp.abc import Application
@@ -98,6 +98,7 @@ def __init__(
         self.dispatcher = dispatcher
         self.handle_in_background = handle_in_background
         self.data = data
+        self._background_feed_update_tasks: Set[asyncio.Task[Any]] = set()
 
     def register(self, app: Application, /, path: str, **kwargs: Any) -> None:
         """
@@ -139,11 +140,13 @@ async def _background_feed_update(self, bot: Bot, update: Dict[str, Any]) -> Non
             await self.dispatcher.silent_call_request(bot=bot, result=result)
 
     async def _handle_request_background(self, bot: Bot, request: web.Request) -> web.Response:
-        asyncio.create_task(
+        feed_update_task = asyncio.create_task(
             self._background_feed_update(
                 bot=bot, update=await request.json(loads=bot.session.json_loads)
             )
         )
+        self._background_feed_update_tasks.add(feed_update_task)
+        feed_update_task.add_done_callback(self._background_feed_update_tasks.discard)
         return web.json_response({}, dumps=bot.session.json_dumps)
 
     def _build_response_writer(