fix(clear_events): handle Python 3.13 QueueShutDown exception for mypy compatibility

- Replace getattr-based exception handling with explicit version check
- Use type(e).__name__ comparison to identify QueueShutDown in Python 3.13+
- Re-raise unexpected exceptions to maintain proper error propagation
- Fixes mypy error: Exception type must be derived from BaseException

Author: meoow113

.gitignore

@@ -5,7 +5,7 @@ __pycache__
 .mypy_cache
 .pytest_cache
 .ruff_cache
-.venv
+.venv-3.11
 coverage.xml
 .nox
 spec.json

.python-version

@@ -1 +1 @@
-3.10
+3.13

src/a2a/server/events/event_queue.py

@@ -192,11 +192,17 @@ async def clear_events(self, clear_child_queues: bool = True) -> None:
                     )
                     self.queue.task_done()
                     cleared_count += 1
-            except (
-                asyncio.QueueEmpty,
-                getattr(asyncio, 'QueueShutDown', asyncio.QueueEmpty),
-            ):
+            except asyncio.QueueEmpty:
                 pass
+            except Exception as e:
+                # Handle Python 3.13+ QueueShutDown
+                if (
+                    sys.version_info >= (3, 13)
+                    and type(e).__name__ == 'QueueShutDown'
+                ):
+                    pass
+                else:
+                    raise
 
             if cleared_count > 0:
                 logger.debug(