Arguments to an ActiveRecord scope will always been passed as a
Dictionnary. Thus
`Dossier.with_notifiable_procedure(notify_on_closed: true)` will trigger
a Ruby 2.7 warning:
> /ruby/2.7.0/gems/activerecord-6.0.3.4/lib/active_record/relation.rb:412: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
Fix the issue by always expecting a Dictionary (rather than keyword
arguments).