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

[Debian testing autoremoval watch]

ruby-buff-config 2.0.0-2 is marked for autoremoval from testing on 2021-11-09

It is affected by these RC bugs:
996142: ruby-buff-config: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed:      RuntimeError:
 https://bugs.debian.org/996142



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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