build: Update Java from 21 to 25 in .github/workflows/gradle-build.yml

Author: thorlauridsen

.github/workflows/gradle-build.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
-          java-version: 21
+          java-version: 25
 
       - name: Use gradle/actions/setup-gradle@v4.3.0
         uses: gradle/actions/setup-gradle@v5.0.0