modernize type hinting

app/decorators.py

@@ -1,7 +1,7 @@
 from flask import abort, request
 from flask_login import current_user
 from functools import wraps
-from typing import List, Union
+from typing import Optional
 from werkzeug.exceptions import NotAcceptable
 from app.models import Permission
 
@@ -46,8 +46,8 @@ def socketio_admin_required(f):
 
 
 def content_negotiation(
-    produces: Union[str, List[str], None] = None,
-    consumes: Union[str, List[str], None] = None
+    produces: Optional[str | list[str]] = None,
+    consumes: Optional[str | list[str]] = None
 ):
     def decorator(f):
         @wraps(f)