chore: Bump Rust edition to 2024 (#27800)

Follow-up to https://github.com/zed-industries/zed/pull/27791

Release Notes:

- N/A

crates/gpui/examples/window_shadow.rs

@@ -1,8 +1,8 @@
 use gpui::{
-    black, canvas, div, green, point, prelude::*, px, rgb, size, transparent_black, white, App,
-    Application, Bounds, Context, CursorStyle, Decorations, Hsla, MouseButton, Pixels, Point,
+    App, Application, Bounds, Context, CursorStyle, Decorations, Hsla, MouseButton, Pixels, Point,
     ResizeEdge, Size, Window, WindowBackgroundAppearance, WindowBounds, WindowDecorations,
-    WindowOptions,
+    WindowOptions, black, canvas, div, green, point, prelude::*, px, rgb, size, transparent_black,
+    white,
 };
 
 struct WindowShadow {}