Update hf export data timings (#469)

Update hf export data timings because of frequent deployments task is missed each day with 24 hours loops

Author: SinatrasC

src/kernelbot/cogs/admin_cog.py

@@ -887,7 +887,7 @@ async def _scheduled_cleanup_temp_users(self):
             db.cleanup_temp_users()
         logger.info("Temporary users cleanup completed")
 
-    @tasks.loop(hours=24)
+    @tasks.loop(hours=6)
     async def _scheduled_hf_export(self):
         """Daily export of active competition submissions to private HF dataset.