Unpin & upgrade winit to 0.30.5 (#4939)

This updates winit to 0.30.5. 

https://github.com/emilk/egui/pull/4849 Had to pin the version to
0.30.2, as a Winit patch changed the behavior of selecting a theme.
Winit 0.30.5 reverts this, so we could stick with `window.theme()`, but
the newly added `ActiveEventLoop::system_theme` is more like what egui
wants anyway, as individual windows can have theme overrides.

Also bump `smithay-clipboard` to prevent some now duplicate
dependencies.

crates/eframe/src/native/glow_integration.rs

@@ -1114,7 +1114,7 @@ impl GlutinWindowContext {
                 viewport_id,
                 event_loop,
                 Some(window.scale_factor() as f32),
-                window.theme(),
+                event_loop.system_theme(),
                 self.max_texture_side,
             )
         });

crates/eframe/src/native/wgpu_integration.rs

@@ -241,7 +241,7 @@ impl WgpuWinitApp {
             ViewportId::ROOT,
             event_loop,
             Some(window.scale_factor() as f32),
-            window.theme(),
+            event_loop.system_theme(),
             painter.max_texture_side(),
         );
 
@@ -869,7 +869,7 @@ impl Viewport {
                     viewport_id,
                     event_loop,
                     Some(window.scale_factor() as f32),
-                    window.theme(),
+                    event_loop.system_theme(),
                     painter.max_texture_side(),
                 ));