Update JDKs for CI

Author: cowtowncoder

.github/workflows/main.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java_version: ['8', '11', '17', '21' ]
+        java_version: ['8', '17', '21', '23' ]
         include:
           - java_version: '8'
             release_build: 'R'