ci: Update to Java 25 (from Java 17)

Author: jajik

.github/workflows/ci.yml

@@ -14,11 +14,11 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
-      - name: Set up JDK 17
+      - name: Set up JDK 25
         uses: actions/setup-java@v5
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 25
           cache: maven
       - name: Build with Maven
         run: ./mvnw --batch-mode --no-transfer-progress verify