fix: point to package.json

.github/workflows/validate-docs.yml

@@ -49,6 +49,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@v4
         with:
+          package_json_file: ./docs/package.json
           run_install: false
       - name: Get pnpm store directory
         shell: bash