Add and apply ArrayCoercion rubocop rule

This rule was added in Rubocop 0.88.0.

db/dev_seeds/users.rb

@@ -17,7 +17,7 @@ section "Creating Users" do
   def unique_document_number
     @document_number ||= 12345678
     @document_number += 1
-    "#{@document_number}#{[*"A".."Z"].sample}"
+    "#{@document_number}#{("A".."Z").to_a.sample}"
   end
 
   admin = create_user("admin@consul.dev", "admin")