k0kubun b5569b9ab2 erb.rb: print deprecation warning with warn level 1
This was planned to be removed in Ruby 2.7 at first, but I changed my
mind to just keep warning it in Ruby 2.7.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66556 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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