ci: bump java version to 25-tem

Author: Bloeckchengrafik

.github/workflows/gradle-build.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up JDK 21
         uses: actions/setup-java@v4.7.1
         with:
-          java-version: '21'
+          java-version: '25'
           distribution: 'temurin'
           server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
           settings-path: ${{ github.workspace }} # location for the settings.xml file