Use Java 25 on the CI.

Author: khatchad

.github/workflows/continuous-integration.yml

@@ -14,10 +14,10 @@ jobs:
       uses: actions/checkout@v4
       with:
         submodules: 'recursive'
-    - name: Set up JDK 21
-      uses: actions/setup-java@v4
+    - name: Set up JDK 25
+      uses: actions/setup-java@v5
       with:
-        java-version: '21'
+        java-version: '25'
         distribution: 'temurin'
         cache: maven
     - name: Install Python.