Update format.yml

Author: ota-meshi

.github/workflows/format.yml

@@ -11,10 +11,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout repo
-        uses: actions/checkout@v4
-      - name: Setup node
-        uses: actions/setup-node@v4
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v2
+      - uses: actions/setup-node@v4
       - name: Install deps
         run: pnpm install -f
       - name: Format