Update to code to Rust 1.67

src/data/users_file_entity.rs

@@ -13,7 +13,7 @@ impl EntityManager<User> {
         F: FnOnce(User) -> User,
     {
         let user = match self.find_by_user_id(id)? {
-            None => return new_error(format!("Failed to find user {:?}", id)),
+            None => return new_error(format!("Failed to find user {id:?}")),
             Some(user) => user,
         };
 
@@ -134,8 +134,7 @@ impl UsersSyncBackend for EntityManager<User> {
         let user = match self.find_by_user_id(id)? {
             None => {
                 return new_error(format!(
-                    "Could not delete account {:?} because it was not found!",
-                    id
+                    "Could not delete account {id:?} because it was not found!"
                 ));
             }
             Some(s) => s,