upgrade jruby to 9.2.8.0 as it fixed some assertions bugs #850
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When investigating issue asciidoctor/asciidoctor-intellij-plugin#337 I found that the latest ruby version fixes some assertions, see jruby/jruby#5693.
As the test suite of AsciidoctorJ runs without errors on this new JRuby release, I suggest an update of JRuby with this PR.