Update to Rust 2024 edition

Formatted code.

src/auth.rs

@@ -1,15 +1,15 @@
 use actix_web::Responder;
 use actix_web::{
-    web::{self, Json},
     HttpResponse,
+    web::{self, Json},
 };
 use chrono::{Duration, Utc};
-use jsonwebtoken::{encode, EncodingKey, Header};
+use jsonwebtoken::{EncodingKey, Header, encode};
 use log::{error, info};
 use std::sync::Mutex;
 
 use crate::{
-    data::{secret_key, Claims, CreateAccountRequest, LoginRequest, Token},
+    data::{Claims, CreateAccountRequest, LoginRequest, Token, secret_key},
     database::UserDao,
 };