Merge pull request #12 from substrate-system/dependabot/github_actions/actions/upload-pages-artifact-4

Bump actions/upload-pages-artifact from 3 to 4

Author: nichoth

.github/workflows/gh-pages-docs.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Build
         run: npm run build-docs
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: docs/