Log Message:
xfce4-taskmanager: update to 1.5.7

1.5.7 (2024-02-29)
=====
- Update copyright year
- build: Fix -Wcast-align warning from clang
- Fix UBSan errors
- settings-dialog: Fix XtmRefreshRate memory leak
- Dark mode for process-statusbar
- Dark mode for process-monitor
- Allow multiple instances via command line option.
- Fix blurry app icons when UI scale > 1
- Use symbolic window picker icon in toolbar
- Fix broken "show-legend" setting sync
- Translation Updates:
  Catalan, Croatian, Estonian, Greek, Hebrew, Italian, Occitan (post
  1500), Polish, Spanish, Swedish, Turkish