fix: ensure Node.js 20+ is used for Next.js build

Author: al7566

.github/workflows/webpack.yml

@@ -24,9 +24,13 @@ jobs:
 
     - name: Setup Bun
       uses: oven-sh/setup-bun@v2
+      with:
+        bun-version: latest
 
     - name: Install dependencies
       run: bun install
 
     - name: Build
-      run: bun run build
+      run: bun run build
+      env:
+        NODE_VERSION: ${{ matrix.node-version }}