Update composer.json to use Larastan Org

Starting with Larastan 2.7.0, the Larastan repository will now be managed under the Larastan organization.

Author: arnebr

composer.json

@@ -25,7 +25,7 @@
     "algolia/algoliasearch-client-php": "^3.4",
     "laravel/scout": "^10.5",
     "meilisearch/meilisearch-php": "^1.4",
-    "nunomaduro/larastan": "^2.4",
+    "larastan/larastan": "^2.4",
     "orchestra/testbench": "^8",
     "yajra/laravel-datatables-html": "^9.3.4|^10"
   },