set pnpm version in package.json to make github CI work

Author: waveproc

package.json

@@ -16,5 +16,10 @@
     "astro-expressive-code": "0.41.3",
     "boxicons": "^2.1.4",
     "tailwindcss": "4.1.12"
-  }
-}
+  },
+  "engines": {
+    "node": ">=22",
+    "pnpm": ">=10"
+  },
+  "packageManager": "^[email protected]"
+}