Fix submodule checkout in github build actions

Author: sciascid

.github/workflows/build.yml

@@ -90,9 +90,8 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
-
-    - name: Checkout submodules
-      uses: textbook/git-checkout-submodule-action@master
+      with:
+        submodules: "recursive"
 
     - name: Install compiler
       run: |