fix(engine): closing of connection pool (#95)

Author: averikitsch

src/llama_index_cloud_sql_pg/engine.py

@@ -398,7 +398,7 @@ def _run_as_sync(self, coro: Awaitable[T]) -> T:
 
     async def close(self) -> None:
         """Dispose of connection pool"""
-        await self._pool.dispose()
+        await self._run_as_async(self._pool.dispose())
 
     async def _ainit_doc_store_table(
         self,