Update ruby-openid to 2.9.2 (#32294).

Patch by Go MAEDA.

git-svn-id: http://svn.redmine.org/redmine/trunk@18746 e93f8b46-1217-0410-a6f0-8f06a7374b81

Gemfile

@@ -28,7 +28,7 @@ end
 
 # Optional gem for OpenID authentication
 group :openid do
-  gem "ruby-openid", "~> 2.3.0", :require => "openid"
+  gem "ruby-openid", "~> 2.9.2", :require => "openid"
   gem "rack-openid"
 end