Fix getting callback params on py3.14+ (#1741)

* Add test to reproduce `TypeError: unsupported callable` on `python >=3.14`

* Fix getting callback params on py3.14+

Add 1741.bugfix.rst

* Code optimization

tests/test_issues/test_1741_forward_ref_in_callbacks.py

@@ -0,0 +1,27 @@
+from sys import version_info
+from typing import TYPE_CHECKING
+
+import pytest
+
+from aiogram.dispatcher.event.handler import HandlerObject
+
+
+@pytest.mark.skipif(
+    version_info < (3, 14), reason="Requires Python >=3.14 for TypeError on unresolved ForwardRef"
+)
+def test_forward_ref_in_callback():
+    if TYPE_CHECKING:
+        from aiogram.types import Message
+
+    def my_handler(message: Message):
+        pass
+
+    HandlerObject(callback=my_handler)
+
+
+def test_forward_ref_in_callback_with_str_annotation():
+    def my_handler(message: "Message"):
+        pass
+
+    handler = HandlerObject(callback=my_handler)
+    assert "message" in handler.params