use recursive checkout for github actions

.github/workflows/cmake-linux.yml

@@ -11,6 +11,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+          submodules: 'true'
 
     - name: Install Dependencies
       run: |

.github/workflows/cmake-windows.yml

@@ -11,6 +11,8 @@ jobs:
     
     steps:
       - uses: actions/checkout@v2
+        with:
+            submodules: 'true'
       
       - name: Restore artifacts, or run vcpkg, build and cache artifacts
         uses: lukka/run-vcpkg@main