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

[Debian testing autoremoval watch]

ruby-avl-tree 1.2.1-1 is marked for autoremoval from testing on 2021-11-24

It is affected by these RC bugs:
996127: ruby-avl-tree: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: Error: test_each_value(TestRedBlackTree): ArgumentError: tried to create Proc object without a block
 https://bugs.debian.org/996127



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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