Remove pnpm from devDependencies in package.json

Author: piquark6046

package.json

@@ -23,7 +23,6 @@
   "devDependencies": {
     "esbuild": "^0.24.0",
     "eslint": "^9.13.0",
-    "pnpm": "^9.12.3",
     "typescript": "^5.6.3",
     "typescript-eslint": "^8.11.0"
   }