Update github workflow to include submodules

Author: Deflaktor

.github/workflows/deploy.yml

@@ -25,7 +25,8 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-        
+          submodules: true
+
       - name: Install, build, and upload your site
         uses: withastro/action@v2