bump ruby-saml-mod version

fixes: CNVS-14531

ruby-saml-mod 0.1.30 fixes a bug with enforcing ISO-8859-1 encoding when
verifying the signature on the XML.  This will fix issues with saml
assertions containing non ASCII characters.

Test Plan:

  - Setup a SAML provider
  - Setup a user in the provider that has a non ASCII/UTF-8 character in the
    attributes passed back with the SAML response.
  - Create a user to match from the provider in Canvas.
  - The user should be able to log in throught the SAML provider.

Change-Id: Ib95c8d87acfad94c0d96957d3c2f0713738854f4
Reviewed-on: https://gerrit.instructure.com/41367
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Reviewed-by: Paul Hinze <paulh@instructure.com>
Product-Review: Nick Cloward <ncloward@instructure.com>