chore(deps): update actions/upload-pages-artifact action to v4

Author: renovate[bot]

.github/workflows/pages.yml

@@ -38,7 +38,7 @@ 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'
       - name: Deploy to GitHub Pages