Update package.json

clients/js/package.json

@@ -38,6 +38,7 @@
   },
   "devDependencies": {
     "@ava/typescript": "^4.1.0",
+    "@solana-program/system": "^0.4.1",
     "@solana/eslint-config-solana": "^3.0.3",
     "@solana/web3.js": "2.0.0-rc.0",
     "@solana/webcrypto-ed25519-polyfill": "2.0.0-rc.0",