Fix linting

lightrag/api/lightrag_server.py

@@ -510,13 +510,14 @@ def check_and_install_dependencies():
         "fastapi",
         # Add other required packages here
     ]
-    
+
     for package in required_packages:
         if not pm.is_installed(package):
             print(f"Installing {package}...")
             pm.install(package)
             print(f"{package} installed successfully")
 
+
 def main():
     # Check if running under Gunicorn
     if "GUNICORN_CMD_ARGS" in os.environ: