Update json_loader.py: encoding bug (#9785)

JSONLoader.load does not specify `encoding` in
`self.file_path.read_text()` as `self.file_path.open()`

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libs/langchain/langchain/document_loaders/json_loader.py

@@ -64,7 +64,7 @@ class JSONLoader(BaseLoader):
                     if line:
                         self._parse(line, docs)
         else:
-            self._parse(self.file_path.read_text(), docs)
+            self._parse(self.file_path.read_text(encoding="utf-8"), docs)
         return docs
 
     def _parse(self, content: str, docs: List[Document]) -> None: