Bump JS client to v0.4.0

clients/js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@solana-program/system",
-  "version": "0.3.3",
+  "version": "0.4.0",
   "description": "JavaScript client for the System program",
   "sideEffects": false,
   "module": "./dist/src/index.mjs",