Fix broken link for Java xml [ci skip]

Author: yhirano55

activesupport/lib/active_support/xml_mini/jdom.rb

@@ -40,7 +40,7 @@ def parse(data)
       else
         @dbf = DocumentBuilderFactory.new_instance
         # secure processing of java xml
-        # http://www.ibm.com/developerworks/xml/library/x-tipcfsx/index.html
+        # https://archive.is/9xcQQ
         @dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false)
         @dbf.setFeature("http://xml.org/sax/features/external-general-entities", false)
         @dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false)