fix: ensure KFP token is returned as a string in RagasEvaluatorRemote

Author: dmaniloff

src/llama_stack_provider_ragas/remote/ragas_remote_eval.py

@@ -111,7 +111,9 @@ def kfp_client(self):
     def _get_kfp_token(self) -> str:
         if self.config.kubeflow_config.pipelines_api_token:
             logger.info("Using KUBEFLOW_PIPELINES_TOKEN from config")
-            return self.config.kubeflow_config.pipelines_api_token.get_secret_value()
+            return str(
+                self.config.kubeflow_config.pipelines_api_token.get_secret_value()
+            )
 
         try:
             from .kubeflow.utils import _load_kube_config