xfce4-panel: update to 4.12.2.
xfce4-panel: update to 4.12.2.

Closes: #9986 [via git-merge-pr]

necrophcodr/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,floGik/void-packages,coredumb/void-packages,coredumb/void-packages,coredumb/void-packages,necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages,floGik/void-packages,floGik/void-packages,coredumb/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,floGik/void-packages,necrophcodr/void-packages,floGik/void-packages,coredumb/void-packages,NeoChontrix/void-packages,floGik/void-packages