fix: add encoding="utf-8" to graph store persist/load methods

llama-index-core/llama_index/core/graph_stores/simple.py

@@ -147,7 +147,7 @@ def persist(
         if not fs.exists(dirpath):
             fs.makedirs(dirpath)
 
-        with fs.open(persist_path, "w") as f:
+        with fs.open(persist_path, "w", encoding="utf-8") as f:
             json.dump(self._data.to_dict(), f)
 
     def get_schema(self, refresh: bool = False) -> str:
@@ -172,7 +172,7 @@ def from_persist_path(
             return cls()
 
         logger.debug(f"Loading {__name__} from {persist_path}.")
-        with fs.open(persist_path, "rb") as f:
+        with fs.open(persist_path, "r", encoding="utf-8") as f:
             data_dict = json.load(f)
             data = SimpleGraphStoreData.from_dict(data_dict)
         return cls(data)

llama-index-core/llama_index/core/graph_stores/simple_labelled.py

@@ -167,7 +167,7 @@ def persist(
         """Persist the graph store to a file."""
         if fs is None:
             fs = fsspec.filesystem("file")
-        with fs.open(persist_path, "w") as f:
+        with fs.open(persist_path, "w", encoding="utf-8") as f:
             f.write(self.graph.model_dump_json())
 
     @classmethod
@@ -180,7 +180,7 @@ def from_persist_path(
         if fs is None:
             fs = fsspec.filesystem("file")
 
-        with fs.open(persist_path, "r") as f:
+        with fs.open(persist_path, "r", encoding="utf-8") as f:
             data = json.loads(f.read())
 
         return cls.from_dict(data)