[DRE-maint] Bug#958445: ruby-attr-encrypted and ruby-acts-as-taggable incompatible with Rails 6

[Frederik Himpe]

I found these ruby gems are still using set_attribute_was, which appears 
to have been removed in rails 6:

vendor_ruby/attr_encrypted/adapters/active_record.rb:                
set_attribute_was(attr, __send__(attr)) if value != __send__(attr)
vendor_ruby/acts_as_taggable_on/taggable/core.rb:                  
set_attribute_was("#{tag_type}_list", #{tag_type}_list)


ii  ruby-acts-as-taggable-on 6.5.0-2~bpo10+1 all          provides 
advanced tagging for Rails
ii  ruby-attr-encrypted      3.1.0-2~bpo10+1 all          Encrypt and 
decrypt attributes

https://github.com/mbleigh/acts-as-taggable-on/issues/955
https://github.com/rolandoalvarado/acts-as-taggable-on/commit/391650aa48c571687844393e16b5d03c88f93be1

https://github.com/attr-encrypted/attr_encrypted/pull/337
attr_encrypted seems pretty much a dead project...

-- 
Frederik Himpe <fhimpe at ai.vub.ac.be>
Vrije Universiteit Brussel