use modern CI rules

.github/workflows/android.yml

@@ -10,9 +10,10 @@ jobs:
     name: Test
     runs-on: ubuntu-18.04
     steps:
-    - uses: actions/checkout@master
-    - name: Checkout submodules
-      uses: textbook/git-checkout-submodule-action@master
+      - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+          
     - name: Loading secrets
       env:
           gservices: ${{ secrets.gservices }}