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

[Debian testing autoremoval watch]

ruby-acts-as-tree 2.8.0-1.1 is marked for autoremoval from testing on 2021-11-09

It is affected by these RC bugs:
996121: ruby-acts-as-tree: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: /usr/share/rubygems-integration/all/gems/activerecord-6.0.3.7/lib/active_record/associations/builder/association.rb:51:in `build_scope': undefined method `arity' for {:class_name=>"LevelMixin", :primary_key=>"id", :foreign_key=>"parent_id", :counter_cache=>nil, :touch=>false, :inverse_of=>:children, :optional=>true}:Hash (NoMethodError)
 https://bugs.debian.org/996121



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