experimental[patch], docs: refine notebook for MyScale SelfQueryRetriever (#22016)

- **Description:** upgrade model to `gpt-4o`

libs/experimental/langchain_experimental/sql/vector_sql.py

@@ -40,7 +40,7 @@ class VectorSQLOutputParser(BaseOutputParser[str]):
     @classmethod
     def from_embeddings(
         cls, model: Embeddings, distance_func_name: str = "distance", **kwargs: Any
-    ) -> BaseOutputParser:
+    ) -> VectorSQLOutputParser:
         return cls(model=model, distance_func_name=distance_func_name, **kwargs)
 
     def parse(self, text: str) -> str: