Downgrade to larastan 2.1.12

Author: yajra

composer.json

@@ -25,7 +25,7 @@
   },
   "require-dev": {
     "maatwebsite/excel": "^3.1.40",
-    "nunomaduro/larastan": "^1.0|^2.1",
+    "nunomaduro/larastan": "^1.0|2.1.12",
     "orchestra/testbench": "6.*|^7.3"
   },
   "autoload": {