Use Rust edition 2024 (#7280)

examples/external_eventloop/src/main.rs

@@ -1,7 +1,7 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
 #![allow(rustdoc::missing_crate_level_docs)] // it's an example
 
-use eframe::{egui, UserEvent};
+use eframe::{UserEvent, egui};
 use std::{cell::Cell, rc::Rc};
 use winit::event_loop::{ControlFlow, EventLoop};