Bump tested jruby to 9.2.9.0

Author: deivid-rodriguez

.github/workflows/ubuntu-rvm.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ 'jruby-9.2.6.0', 'ruby-head' ]
+        ruby: [ 'jruby-9.2.9.0', 'ruby-head' ]
       fail-fast: false
     steps:
     - uses: actions/checkout@master