Update CI checkout to use submodules

Author: tnagorra

.github/workflows/actions.yml

@@ -14,10 +14,12 @@ jobs:
         python-version: [3.8]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
+      with:
+        submodules: 'true'
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}