Quickfix: forgot to clone submodules when building and publishing pypi package

.github/workflows/publish-to-test.yaml

@@ -11,6 +11,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+      with:
+        submodules: "true"
     - name: Set up Python
       uses: actions/setup-python@v4
       with:

.github/workflows/publish.yaml

@@ -11,6 +11,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+      with:
+        submodules: "true"
     - name: Set up Python
       uses: actions/setup-python@v4
       with: