remove typing

app.py

@@ -1,5 +1,3 @@
-from typing import Union
-
 from fastapi import FastAPI
 
 app = FastAPI()
@@ -11,5 +9,5 @@ def read_root():
 
 
 @app.get("/items/{item_id}")
-def read_item(item_id: int, q: Union[str, None] = None):
+def read_item(item_id: int, q: str | None = None):
     return {"item_id": item_id, "q": q}