CI: migrate workflows to setup-node v4 (#145)

Author: eeemmmmmm

.github/workflows/nextjs.yml

@@ -49,7 +49,7 @@ jobs:
             exit 1
           fi
       - name: Setup Node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: '16'
           cache: ${{ steps.detect-package-manager.outputs.manager }}