Log Message:
xfce4-power-manager: update to 4.18.2

Change log:

4.18.2 (2023-05-30)
======
- Fix typos in previous backported commit
- Keep "lock-on-sleep" in sync with other components via XfceScreensaver
- power: Fix old typo
- Do not check repeatedly for logind running
- Write on stderr when appropriate
- build: Require gio-unix-2.0
- settings: Keep a ref on device to avoid use-after-free (Fixes #56)
- dpms: Add missing sanity checks (Fixes #163)
- Fix Xfconf memory management
- Update bug report address
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