Include submodules on checkout.

Author: dgarske

.github/workflows/build-keytools-windows.yml

@@ -15,6 +15,8 @@ jobs:
     # Step 1: Checkout the repository
     - name: Checkout Code
       uses: actions/checkout@v3
+      with:
+          submodules: true
 
     # Step 2: Setup MSBuild
     - name: Setup MSBuild