ci: add jdk 19-21

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        jdk: [ '12', '13', '14', '15', '16', '17', '18' ]
+        jdk: [ '12', '13', '14', '15', '16', '17', '18', '19', '20', '21' ]
     name: JDK ${{ matrix.jdk }}
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4