fix: wrap await task in try/except in async generator finally block

Addresses code quality review comment about bare 'await task' having
no visible effect. Now consistently handles CancelledError/Exception
in both the normal and cancellation paths of the finally block.

Co-Authored-By: João <joao@crewai.com>

lib/crewai/src/crewai/utilities/streaming.py

@@ -335,7 +335,10 @@ async def create_async_chunk_generator(
             yield item
     finally:
         if not cancel_event.is_set():
-            await task
+            try:
+                await task
+            except (asyncio.CancelledError, Exception):  # noqa: S110
+                pass
         else:
             if not task.done():
                 task.cancel()