feat(app): use simpler syntax for enqueue_batch threaded execution

Author: psychedelicious

invokeai/app/services/session_queue/session_queue_sqlite.py

@@ -103,8 +103,7 @@ def _get_highest_priority(self, queue_id: str) -> int:
         return cast(Union[int, None], self.__cursor.fetchone()[0]) or 0
 
     async def enqueue_batch(self, queue_id: str, batch: Batch, prepend: bool) -> EnqueueBatchResult:
-        loop = asyncio.get_event_loop()
-        return await loop.run_in_executor(None, self._enqueue_batch, queue_id, batch, prepend)
+        return await asyncio.to_thread(self._enqueue_batch, queue_id, batch, prepend)
 
     def _enqueue_batch(self, queue_id: str, batch: Batch, prepend: bool) -> EnqueueBatchResult:
         try: