xfce4-thunar: update to 4.18.7

Change log:

4.18.7 (2023-09-02)
======
- Fix property dialog file count (#1173)
- Don't store GFile pointer in GTK pointer
- Don't reload the directory on copy or cut (#1060)
- Add folder to history only for new tab (Issue #1072)
- Fix job operation crash on error
- Limit number of templates to prevent lag (#472)
- Prevent crash on multi-file-activate (#1121)
- Remove unneeded menu separator
- Switch zoom shortcuts
- Prevent glib-critical - followup of (#912)
- Keep location selector state on focus lost (#912)
- Prevent minor memory leak (#573)
- Translation Updates:
  Catalan, Czech, Finnish, French, German, Greek, Interlingue, Polish,
  Portuguese (Brazil), Serbian, Spanish, Turkish

(gutteridge)