fix: change sync_get_file_content_dicts to use get_file_content_dicts (…

…#3250)

feat: refactor sync_get_file_content_dicts to use get_file_content_dicts

Refactor the `sync_get_file_content_dicts` method in the `Message` class to use the `get_file_content_dicts` method instead. This change improves the code by using a more descriptive and accurate method name.

src/backend/base/langflow/schema/message.py

@@ -164,7 +164,7 @@ def serialize_text(self, value):
         return value
 
     def sync_get_file_content_dicts(self):
-        coro = self.aget_file_content_dicts()
+        coro = self.get_file_content_dicts()
         loop = asyncio.get_event_loop()
         return loop.run_until_complete(coro)