Fix compatibility with pydantic 1.5 (temporary)

aiogram/dispatcher/event/handler.py

@@ -20,10 +20,14 @@ class CallableMixin:
     spec: inspect.FullArgSpec = field(init=False)
 
     def __post_init__(self) -> None:
-        callback = self.callback
+        callback = inspect.unwrap(self.callback)
         self.awaitable = inspect.isawaitable(callback) or inspect.iscoroutinefunction(callback)
-        while hasattr(callback, "__wrapped__"):  # Try to resolve decorated callbacks
-            callback = callback.__wrapped__  # type: ignore
+        if isinstance(callback, BaseFilter):
+            # Pydantic 1.5 has incorrect signature generator
+            # Issue: https://github.com/samuelcolvin/pydantic/issues/1419
+            # Fixes: https://github.com/samuelcolvin/pydantic/pull/1427
+            # TODO: Remove this temporary fix
+            callback = inspect.unwrap(callback.__call__)
         self.spec = inspect.getfullargspec(callback)
 
     def _prepare_kwargs(self, kwargs: Dict[str, Any]) -> Dict[str, Any]:

aiogram/dispatcher/handler/base.py

@@ -30,7 +30,7 @@ class BaseHandler(BaseHandlerMixin[T], ABC):
 
     @property
     def update(self) -> Update:
-        return cast(Update, self.data["update"])
+        return cast(Update, self.data.get("update", self.data.get("event_update")))
 
     @abstractmethod
     async def handle(self) -> Any:  # pragma: no cover