Processed: Removing libgtk2-perl from testing

[Debian Bug Tracking System]

Processing control commands:

> severity -1 serious
Bug #912882 [src:gmusicbrowser] gmusicbrowser: Depends on libgtk2-perl, that won't be part of Bullseye
Severity set to 'serious' from 'normal'

-- 
912882: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=912882
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