Revert actions/upload-pages-artifact@v4 to v3

Author: davidde

.github/workflows/nextjs.yml

@@ -80,7 +80,7 @@ jobs:
           REACT_APP_ALCHEMY_API_KEY: ${{ secrets.REACT_APP_ALCHEMY_API_KEY }}
           REACT_APP_ETHERSCAN_API_KEY: ${{ secrets.REACT_APP_ETHERSCAN_API_KEY }}
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ./.next/standalone