Remove unneeded checkout

Author: agriyakhetarpal

.github/workflows/deploy.yml

@@ -61,8 +61,6 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/[email protected]
       - uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
         with:
           name: jupyterlite-demo-dist-${{ github.run_number }}