chore: migrate from npm to pnpm

package.json

@@ -10,13 +10,14 @@
   "main": "api/webhook.js",
   "scripts": {
     "dev": "vercel dev",
-    "deploy": "vercel deploy --prod && npm run register",
+    "deploy": "vercel deploy --prod && pnpm register",
     "register": "node --env-file=.env.deploy scripts/register-webhook.js",
     "register:dry": "node --env-file=.env.deploy scripts/register-webhook.js --dry-run",
     "describe": "node --env-file=.env.deploy scripts/set-bot-description.js",
     "describe:dry": "node --env-file=.env.deploy scripts/set-bot-description.js --dry-run",
     "lint": "node scripts/check-secret-leaks.js"
   },
+  "packageManager": "pnpm@11.1.1",
   "license": "Apache-2.0",
   "dependencies": {
     "@upstash/redis": "^1.38.0",
@@ -28,5 +29,8 @@
     "form-data": "^2.5.4",
     "qs": "^6.14.1",
     "tough-cookie": "^4.1.3"
+  },
+  "pnpm": {
+    "onlyBuiltDependencies": ["es5-ext"]
   }
 }