Bump JS client to Kit v4 (#11)

Author: lorisleiva

clients/js/package.json

@@ -34,12 +34,12 @@
   },
   "license": "MIT",
   "peerDependencies": {
-    "@solana/kit": "^3.0.0"
+    "@solana/kit": "^4.0.0"
   },
   "devDependencies": {
     "@ava/typescript": "^4.1.0",
     "@solana/eslint-config-solana": "^3.0.0",
-    "@solana/kit": "^3.0.0",
+    "@solana/kit": "^4.0.0",
     "@types/node": "^24",
     "@typescript-eslint/eslint-plugin": "^7.3.1",
     "@typescript-eslint/parser": "^7.3.1",