Avoid blocking event loop when using DataFusionAsyncHook by replacing…

… sleep by asyncio.sleep (#33756)

airflow/providers/google/cloud/hooks/datafusion.py

@@ -17,6 +17,7 @@
 """This module contains Google DataFusion hook."""
 from __future__ import annotations
 
+import asyncio
 import json
 import os
 from time import monotonic, sleep
@@ -528,7 +529,7 @@ async def _get_link(self, url: str, session):
                     break
                 except Exception as exc:
                     if "404" in str(exc):
-                        sleep(time_to_wait)
+                        await asyncio.sleep(time_to_wait)
                     else:
                         raise
         if pipeline: