Bug#982925: Request for testing: GTK for bullseye with improved CUPS printing support

[Jaycee Santos]

Update: I tested the laptop running Linux Mint when I still had GTK
3.24.24-4+deb11u2~mr6 installed on the test PC. I thought being able to print
from the laptop running Linux Mint was always possible, but I was wrong.
When I reverted to 3.24.24-4 on the test PC, I was no longer able to print from
the laptop either.

Of course, this is a separate bug, but I thought I should share this info
here to make it clear that it was a side effect of mr6.

Jaycee