Upgrade to JDK 25. (#127)

Author: devopsix

.github/workflows/build.yml

@@ -11,8 +11,8 @@ jobs:
       - name: Set up JDK/Maven
         uses: actions/setup-java@v5
         with:
-          distribution: 'zulu'
-          java-version: 11
+          distribution: temurin
+          java-version: 25
       - name: Build and verify all modules
         run: >-
           mvn

.github/workflows/release.yml

@@ -41,8 +41,8 @@ jobs:
       - name: Set up JDK/Maven
         uses: actions/setup-java@v5
         with:
-            distribution: 'zulu'
-            java-version: 11
+          distribution: temurin
+          java-version: 25
       - name: Configure Maven settings
         uses: whelk-io/maven-settings-xml-action@v22
         with: