Update actions/upload-pages-artifact action to v4

Author: xdev-renovate

.github/workflows/antora-build.yml

@@ -38,7 +38,7 @@ jobs:
         uses: actions/configure-pages@v5
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           name: site
           path: docs/site