Log Message:
Update ruby-tzinfo to 0.3.13.

Changes:
* Updated to tzdata version 2009f
  (http://article.gmane.org/gmane.comp.time.tz/2668).
* Untaint the timezone module filename after validation to allow use
  with $SAFE == 1 (e.g. under mod_ruby). Thanks to Dmitry Borodaenko
  for the suggestion. Closes #25349.