[CI] Updates JRuby in GitHub Actions

Author: picandocodigo

.github/workflows/7.x.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ 2.5, 2.6, 2.7, 3.0, jruby-9.2 ]
+        ruby: [ 2.5, 2.6, 2.7, 3.0, jruby-9.3 ]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2