Log Message:
xfce4-clipman-plugin: update to 1.6.6

1.6.6 (2024-02-29)
=====
- Update copyright year
- Use X11 clipboard manager from libxfce4ui if available
- collector: Fix sanity check
- history: Make search case-sensitive
- actions: Update gimp command (Fixes #96)
- build: Use system wlr-protocols if avail or fall back to submodule
- clipboard-manager: Add missing static qualifier
- build: Lower xfce4-dev-tools requirements to stable version
- Fix xfce_titled_dialog_create_action_area() deprecation
- build: Simplify and clarify X11/Wayland distinction
- build: Define our own windowing macro instead of extending GDK's
- build: Add check for gdk-wayland
- Translation Updates:
  Catalan, Estonian, Finnish, Hebrew, Italian, Russian, Spanish,
  Swedish, Turkish