Fix GitHub Actions pnpm setup

Author: optiflow

.github/workflows/ci.yml

@@ -15,15 +15,18 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 11.5.1
+          run_install: false
+
       - name: Set up Node
         uses: actions/setup-node@v4
         with:
           node-version: "24"
           cache: pnpm
 
-      - name: Enable pnpm
-        run: corepack enable pnpm
-
       - name: Set up Python
         uses: actions/setup-python@v5
         with:

.github/workflows/deploy-docs.yml

@@ -31,15 +31,18 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 11.5.1
+          run_install: false
+
       - name: Set up Node
         uses: actions/setup-node@v4
         with:
           node-version: "24"
           cache: pnpm
 
-      - name: Enable pnpm
-        run: corepack enable pnpm
-
       - name: Install dependencies
         run: pnpm install --frozen-lockfile