chore: migrate to Rust 2024 edition

examples/copy.rs

@@ -1,5 +1,5 @@
 use cosmic_files::operation::recursive::Method;
-use cosmic_files::operation::{recursive::Context, Controller, ReplaceResult};
+use cosmic_files::operation::{Controller, ReplaceResult, recursive::Context};
 use std::{error::Error, io, path::PathBuf};
 
 #[compio::main]

examples/dialog.rs

@@ -1,8 +1,9 @@
 use cosmic::{
+    Application, Element,
     app::{self, Core, Settings, Task},
     executor,
-    iced::{window, Subscription},
-    widget, Application, Element,
+    iced::{Subscription, window},
+    widget,
 };
 use cosmic_files::dialog::{
     Dialog, DialogChoice, DialogChoiceOption, DialogFilter, DialogFilterPattern, DialogKind,