ci: add jruby coverage for ruby-saml #3465
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What problem is this PR intended to solve?
ruby-saml is in the process of migrating off REXML, and have been finding edge case bugs including long-standing JRuby impl bugs, so I want to make sure we have jruby coverage as well as cruby coverage on that project.
I'm not going to add truffleruby coverage. We're testing Nokogiri against truffleruby and truffleruby-head already, and it uses the C extension, so testing ruby-saml with it doesn't provide additional test coverage, but it would provide a rich source of false negatives (see oracle/truffleruby#3503 for context).