fix(native): draw the desktop's cursor on Wayland

[omartelo]

What

Bumps lichdotdev/gio (branch drop-event) to c389a6eb, which fixes two cursor bugs in the native window on Wayland, reported on niri with noctalia:

• Wrong cursor theme. Gio drew the cursor itself from XCURSOR_THEME / XCURSOR_SIZE in its environment. niri keeps the theme in its own config, so lich fell back to the default xcursor theme. The window now sets its cursor through wp_cursor_shape_v1: it names a shape and the compositor draws it in its own theme, size and scale. niri and Hyprland both have the protocol.
• Cursor jumping on a smaller monitor. The window starts at the largest scale of all outputs and loaded its cursor theme at that scale once. On an output with a smaller scale, the cursor kept the old images while hotspots were divided by the new scale, so it jumped as the pointer entered the window. Without cursor-shape-v1, the window now reloads the cursor theme when its scale changes.

Verification

• native/: gofmt -l ., go vet ./... and go test ./... clean.
• Tested by the reporter on niri across two monitors with different scales: the cursor matches the desktop and no longer jumps.
• The Gio change is in the cgo Wayland boundary (app/os_wayland.go plus generated protocol code), with no unit test.