Update the java version to 21 from 17

Author: kavi707

.github/workflows/android-ci.yml

@@ -15,11 +15,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
 
       - name: Cache Gradle files
         uses: actions/cache@v3