Fix failing docs build in CI (#1542)

Author: jainapurva

Diff for: .github/workflows/doc_build.yml

@@ -91,7 +91,7 @@ jobs:
           ref: gh-pages
           persist-credentials: true
       - name: Download artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: Doc-Build
           path: docs