upgrade artifact upload action

Author: dimitri-yatsenko

.github/workflows/main.yml

@@ -38,7 +38,7 @@ jobs:
           cd book
           myst build --html
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v4
         with:
           path: './book/_build/html'
       - name: Deploy to GitHub Pages