Revert JRuby 10 change temporarily

This reverts commit 4e039ed.

Only reverting because there's nobody to release setup-ruby and the released version does not work with jruby-head as 10.

Author: headius

find-jruby-head-url-nokogiri.rb

@@ -12,7 +12,7 @@
 versions = Nokogiri::XML(xml).css('version').map(&:text)
 
 versions.delete('9000.dev-SNAPSHOT')
-most_recent = versions.max_by { |v| Gem::Version.new(v) }
+most_recent = versions.grep(/^9\.4/).max_by { |v| Gem::Version.new(v) }
 
 builds_url = "#{base_url}/#{most_recent}/maven-metadata.xml"
 STDERR.puts builds_url