require xmlsec without security vulnerability
require xmlsec without security vulnerability

Change-Id: I1a6cfc7b8f2797a9346cd0e9e611dbb9d29a7f33
Reviewed-on: https://gerrit.instructure.com/152334
Tested-by: Jenkins
Reviewed-by: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

instructure/ruby-saml2,instructure/ruby-saml2