build: make android build work again 3

Author: johannesjo

.github/workflows/build-android.yml

@@ -20,7 +20,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
       #      - name: Build with Gradle