(SERVER-1954) Bump jruby-utils to 0.12.0
(SERVER-1954) Bump jruby-utils to 0.12.0

This commit updates jruby-utils to 0.12.0, which changes the encoding
settings for the JRuby scripting containers to be UTF-8 by default,
instead of US-ASCII. This avoids a corner-case bug when interpolating
translated strings containing Unicode characters.

puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver