fix(ci): specify pnpm version in landingpage workflow

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: GenerQAQ

.github/workflows/landingpage-test.yaml

@@ -29,6 +29,8 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
+        with:
+          version: 10
 
       - name: Set up Node.js
         uses: actions/setup-node@v6
@@ -56,6 +58,8 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
+        with:
+          version: 10
 
       - name: Set up Node.js
         uses: actions/setup-node@v6
@@ -88,6 +92,8 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
+        with:
+          version: 10
 
       - name: Set up Node.js
         uses: actions/setup-node@v6