fix(ci): resolve linter errors SIM105 and PYI034/ANN204

Author: Wondr-design

src/a2a/server/request_handlers/default_request_handler.py

@@ -2,6 +2,7 @@
 import logging
 
 from collections.abc import AsyncGenerator
+from contextlib import suppress
 from typing import cast
 
 from a2a.server.agent_execution import (
@@ -447,10 +448,8 @@ async def _cleanup_producer(
         """Cleans up the agent execution task and queue manager entry."""
         if cancel:
             producer_task.cancel()
-        try:
+        with suppress(asyncio.CancelledError):
             await producer_task
-        except asyncio.CancelledError:
-            pass
         await self._queue_manager.close(task_id)
         async with self._running_agents_lock:
             self._running_agents.pop(task_id, None)

src/a2a/utils/telemetry.py

@@ -86,7 +86,7 @@ class _NoOp:
         def __call__(self, *args: Any, **kwargs: Any) -> Any:
             return self
 
-        def __enter__(self) -> '_NoOp':
+        def __enter__(self) -> Any:
             return self
 
         def __exit__(self, *args: object, **kwargs: Any) -> None: