Gemfile: update ruby-openid version above 2.3.0 (#14919)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12173 e93f8b46-1217-0410-a6f0-8f06a7374b81

Gemfile

@@ -14,7 +14,7 @@ end
 
 # Optional gem for OpenID authentication
 group :openid do
-  gem "ruby-openid", "~> 2.2.3", :require => "openid"
+  gem "ruby-openid", "~> 2.3.0", :require => "openid"
   gem "rack-openid"
 end