Upgrade GitHub Actions to latest versions

Author: salmanmkc

.github/workflows/docs.yml

@@ -43,7 +43,7 @@ jobs:
       run: touch doc/_build/html/.nojekyll
 
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v3
+      uses: actions/upload-pages-artifact@v4
       with:
         path: ./doc/_build/html