Revert docs workflow to upload-pages-artifact@v3

Author: KennyVaneetvelde

.github/workflows/docs.yml

@@ -35,7 +35,7 @@ jobs:
           make html
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@v3
         with:
           path: docs/_build/html