Fix doc generation github actions (#19)

* Use upload-artifacts@v3 instead of v2 which is deprecated

Author: cedric-chedaleux

.github/workflows/main.yml

@@ -21,6 +21,6 @@ jobs:
            mv _site/group__uprofile.html _site/index.html
         name: Generate doc
       - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
       - name: Deploy to GitHub Pages
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4