libxfce4ui: update to 4.18.5

4.18.5 (2024-02-05)
======
- Update copyright year
- build: Search for bind_textdomain_codeset in libintl too
- sm-client: Reset SmcConnection when IceConnection is closed on error
- docs: Improve xfce_sm_client_get()
- shortcuts-grabber: Fix filtering by level
- shortcuts-grabber: Simplify filtering by group
- shortcuts-grabber: Variable renaming
- shortcuts-grabber: Filter grabbing by key level
- Detect keyboard shortcuts with only single modifier keys on key
release
- Translation Updates:
  Albanian, Amharic, Arabic, Armenian, Armenian (Armenia), Asturian,
  Azerbaijani, Basque, Belarusian, Bengali, Bulgarian, Catalan, Chinese
  (China), Chinese (Hong Kong), Chinese (Taiwan), Croatian, Czech,
  Danish, Dutch, Eastern Armenian, English (Australia), English (United
  Kingdom), Estonian, Finnish, French, Galician, Georgian, German,
  Greek, Hebrew, Hungarian, Icelandic, Indonesian, Interlingue,
  Italian, Japanese, Kazakh, Korean, Lithuanian, Malay, Norwegian
  Bokm奪l, Norwegian Nynorsk, Occitan (post 1500), Persian (Iran),
  Polish, Portuguese, Portuguese (Brazil), Romanian, Russian, Serbian,
  Slovak, Slovenian, Spanish, Swedish, Telugu, Thai, Turkish,
  Ukrainian, Uyghur, Welsh

(gutteridge)