ci: use pnpm/action-setup to setup pnpm (#560)

Author: sushichan044

.github/workflows/autofix.yml

@@ -14,7 +14,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - run: corepack enable
+
+      - uses: pnpm/action-setup@v4
+        with:
+          run_install: false
+
       - uses: actions/setup-node@v4
         with:
           node-version: 20

.github/workflows/ci.yml

@@ -17,7 +17,11 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v4
-      - run: corepack enable
+
+      - uses: pnpm/action-setup@v4
+        with:
+          run_install: false
+
       - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}