Bump newIDE version

Author: 4ian

newIDE/electron-app/app/package.json

@@ -2,7 +2,7 @@
   "name": "gdevelop",
   "productName": "GDevelop 5",
   "description": "GDevelop 5 IDE - the open-source, cross-platform game engine designed for everyone",
-  "version": "5.6.256",
+  "version": "5.6.257",
   "author": "GDevelop Team <hello@gdevelop.io>",
   "license": "MIT",
   "homepage": "https://gdevelop.io",