use java 21

Author: zspitzer

.github/workflows/ci.yml

@@ -10,10 +10,10 @@ jobs:
       #luceeVersionQuery: 6.0.3/all/jar
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 11
+    - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
-        java-version: '11'
+        java-version: '21'
         distribution: 'adopt'
     - name: Cache Maven packages
       if: always()