fix: rename Java step label to 21

Author: Johann

.github/workflows/build-android.yml

@@ -21,7 +21,7 @@ jobs:
           node-version: "22"
           cache: "npm"
 
-      - name: Set up Java 17
+      - name: Set up Java 21
         uses: actions/setup-java@v4
         with:
           distribution: "temurin"