Update gh-pages.yml

Author: simongravelle

.github/workflows/gh-pages.yml

@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           context: .
-          submodules: true 
+          submodules: recursive
           fetch-depth: 0
       - name: Set up Python
         uses: actions/setup-python@v2.2.1