Update github workflow build-android-ndk21.yml

Author: janbar

.github/workflows/build-android-ndk21.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
-      - name: set up JDK 11
+      - name: set up JDK 17
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 17
       - name: Setup Android SDK
         uses: android-actions/setup-android@v2
       - name: Run sdkmanager update