Update actions/upload-pages-artifact action to v4

Author: renovate[bot]

.github/workflows/github-pages.yml

@@ -45,7 +45,7 @@ jobs:
         uses: actions/configure-pages@v5
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: './site'