Bump actions/upload-pages-artifact from 3 to 4 (#86)

Author: glensc

.github/workflows/docs-upload.yml

@@ -62,7 +62,7 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: docs/_build/html
       - name: Deploy to GitHub Pages