linters fixes

main.py

@@ -1,6 +1,7 @@
+from contextlib import asynccontextmanager
+
 import uvicorn
 from fastapi import FastAPI
-from contextlib import asynccontextmanager
 
 
 @asynccontextmanager
@@ -17,6 +18,5 @@ def main():
     uvicorn.run(app_factory, factory=True, host="0.0.0.0", port=8000)
 
 
-
 if __name__ == "__main__":
     main()