fix: Avoid unexpected keyword argument for sentence_transformers (#1269)

Now that remote-vllm include inline::sentence_transformers there is an
issue building the image:
Error building stack:
SentenceTransformersInferenceConfig.sample_run_config() got an
unexpected keyword argument '__distro_dir__'

To avoid that issue this fix extends the sample_run_config to accept
extra kwargs

llama_stack/providers/inline/inference/sentence_transformers/config.py

@@ -11,5 +11,5 @@ from pydantic import BaseModel
 
 class SentenceTransformersInferenceConfig(BaseModel):
     @classmethod
-    def sample_run_config(cls) -> Dict[str, Any]:
+    def sample_run_config(cls, **kwargs) -> Dict[str, Any]:
         return {}