Update composer.json to use larastan org.

Author: farishrf

composer.json

@@ -22,7 +22,7 @@
   },
   "require-dev": {
     "maatwebsite/excel": "^3.1.46",
-    "nunomaduro/larastan": "^2.4",
+    "larastan/larastan": "^2.4",
     "orchestra/testbench": "^8",
     "rap2hpoutre/fast-excel": "^5.1",
     "barryvdh/laravel-snappy": "^1.0.1"