[DRE-maint] ruby-gruff is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-gruff 0.6.0-2 is marked for autoremoval from testing on 2023-11-25

It is affected by these RC bugs:
1054733: ruby-gruff: FTBFS: ERROR: Test "ruby3.1" failed:   NoMethodError: undefined method `background_color=' for [...]
 https://bugs.debian.org/1054733



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https://salsa.debian.org/release-team/release-tools/-/blob/master/mailer/mail_autoremovals.pl

Autoremoval data is generated by:
https://salsa.debian.org/qa/udd/-/blob/master/udd/testing_autoremovals_gatherer.pl