Use Node.js 20 on CI

Author: ai

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
           cache: pnpm
       - name: Install all dependencies
         run: pnpm install --frozen-lockfile --ignore-scripts