Fix Deploy Docs action

Author: vitcpp

.github/workflows/deploy-docs.yml

@@ -42,7 +42,7 @@ jobs:
       uses: actions/configure-pages@v3
 
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v2
+      uses: actions/upload-pages-artifact@v4
       with:
         path: 'doc/html'