Bump actions/upload-pages-artifact from 3 to 4 (#1111)

Author: dependabot[bot]

.github/workflows/pages.yml

@@ -30,7 +30,7 @@ jobs:
           mkdir pages
           cp -R .github/antora-docs/. pages
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: pages