Drop token_name field

service user tokens can't have names.

src/noteburst/jupyterclient/user.py

@@ -98,7 +98,6 @@ async def create(
             "username": username,
             "name": "Noteburst",
             "token_type": "service",
-            "token_name": f"noteburst {float(time.time())!s}",
             "scopes": scopes,
             "expires": int(time.time() + lifetime),
         }