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

[Debian testing autoremoval watch]

ruby-commonmarker 0.21.0-1 is marked for autoremoval from testing on 2021-11-25

It (build-)depends on packages with these RC bugs:
996218: ruby-enum: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed:        expected Ruby::Enum::Errors::UninitializedConstantError, got #<ArgumentError: wrong number of arguments (given 2, expected 0..1)> with backtrace:
 https://bugs.debian.org/996218



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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