Update GitHub Actions workflow to use GraalVM Java 25

Author: ujibang

.github/workflows/ci.yml

@@ -14,11 +14,11 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
 
-    - name: Set up JDK 24
+    - name: Set up JDK 25
       uses: actions/setup-java@v4
       with:
-        distribution: "temurin"
-        java-version: "24"
+        distribution: "graalvm"
+        java-version: "25"
         cache: "maven"
 
     - name: Build with Maven