CI: use jruby-9.2.17.0

Author: olleolleolle

.github/workflows/ubuntu.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '3.0', 2.7, 2.6, 2.5, 2.4, head, jruby-9.2.16.0, jruby-head ]
+        ruby: [ '3.0', 2.7, 2.6, 2.5, 2.4, head, jruby-9.2.17.0, jruby-head ]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby