respond to PR comment- change API call to use public cyto-dl method

src/allencell_ml_segmenter/services/prediction_service.py

@@ -90,7 +90,7 @@ def _predict_model(self, _: Event) -> None:
             cyto_api.override_config(
                 self.build_overrides(experiment_name, checkpoint_selected)
             )
-            asyncio.run(cyto_api._predict_async())
+            asyncio.run(cyto_api.predict(run_async=True))
 
     def build_overrides(
         self, experiment_name: str, checkpoint: str