Update dawidd6/action-download-artifact action to v20 (#1472)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/publish-docs.yml

@@ -17,7 +17,7 @@ jobs:
         run: echo "$GITHUB_CONTEXT"
 
       - name: Download artifact
-        uses: dawidd6/action-download-artifact@v19
+        uses: dawidd6/action-download-artifact@v20
         if: github.event.workflow_run.conclusion == 'success'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}