fix: use JDK 25 instead of 21 to make CI build

Author: cbeyls

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
       uses: actions/setup-java@v5
       with:
         distribution: 'temurin'
-        java-version: '21'
+        java-version: '25'
 
     - name: Set up Gradle
       uses: gradle/actions/setup-gradle@v6