rubygem-rack-1_1: update to security version 1.1.6

- updated to version 1.1.6
* Fix CVE-2013-0263, timing attack against Rack::Session::Cookie
* Fix CVE-2013-0262, symlink path traversal in Rack::File
- from 1.1.5:
* [SEC] Rack::Auth::AbstractRequest no longer symbolizes arbitrary strings
* Fixed erroneous test case in the 1.3.x series

- update to version 1.1.4

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