fix linting

examples/lightrag_tidb_demo.py

@@ -55,6 +55,7 @@ async def get_embedding_dim():
     embedding_dim = embedding.shape[1]
     return embedding_dim
 
+
 async def initialize_rag():
     # Detect embedding dimension
     embedding_dimension = await get_embedding_dim()
@@ -82,6 +83,7 @@ async def initialize_rag():
 
     return rag
 
+
 async def main():
     try:
         # Initialize RAG instance