Log Message:
xfce4-panel: update to 4.16.5

Change log:

4.16.5 (2022-08-20)
======
- systray: Help to keep status notifiers from vanishing (#102, #243, #599)
- panel: Populate item dialog after setting dialog screen (Fixes #62)
- systray: Perform sanity checks also for "NewStatus" signal (Fixes #602)
- pager: Properly disconnect signal handler
- tasklist: Guard against null workspace
- panel: Be sure to save plugins before xfconf_shutdown()
- tasklist: Fix critical warning when starting on a disconnected device
- Update `.gitignore`
- libxfce4panel: Destroy plugin prefs dialog on plugin "destroy" signal
- build: Fix intltool lock file problem during make distcheck
- prefs-dialog: Filter out irrelevant selection changes in "Items" tab
- wrapper: Ensure that provider stays alive when processing "g-signal"
- Revert "panel: Keep a reference on item during drag and drop"
- tasklist: Fix wireframe for CSD windows (v2) (#562)
- Translation Updates:
  English (United Kingdom), Georgian, Greek, Panjabi (Punjabi), Russian