update sitemap yml

Author: EliLawrence

.github/workflows/gha_generate_sitemap.yml

@@ -20,13 +20,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: "3.9"
-
-    - name: Download sitemap data
-      uses: actions/download-artifact@v4
-      with:
-        name: sitemap-data
-        path: sitemap_data/
-      
+  
     - name: Generate sitemap
       run: python generate_sitemap.py