Drop jruby on CI
Drop jruby on CI

jmfarina/redmine_dashboard,intfrr/redmine_dashboard,jmfarina/redmine_dashboard,XML-Travelgate/redmine_dashboard,jgraichen/redmine_dashboard,XML-Travelgate/redmine_dashboard,jmfarina/redmine_dashboard,jgraichen/redmine_dashboard,jgraichen/redmine_dashboard,intfrr/redmine_dashboard,jmfarina/redmine_dashboard,intfrr/redmine_dashboard,intfrr/redmine_dashboard