fix(ci): remove duplicate pnpm version spec conflicting with packageManager

.github/workflows/deploy-github-pages.yml

@@ -20,8 +20,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: pnpm/action-setup@v4
-        with:
-          version: 11
       - uses: actions/setup-node@v4
         with:
           node-version: '24'

.github/workflows/verify-build.yml

@@ -19,8 +19,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: pnpm/action-setup@v4
-        with:
-          version: 11
       - uses: actions/setup-node@v4
         with:
           node-version: '24'